Answer:
289.8 grams.
Explanation:
When the ice cube melts, it absorbs heat from the water in the dog's dish and undergoes a phase change from solid to liquid at 0.00 °C. The heat absorbed by the ice cube can be calculated using the formula:
Q = m * L
where Q is the heat absorbed, m is the mass of the ice cube, and L is the heat of fusion of water (which is 334 J/g). The heat absorbed by the ice cube is then equal to the heat released by the water, which can be calculated using the formula:
Q = m * c * ΔT
where m is the mass of the water, c is the specific heat capacity of water (which is 4.184 J/g·°C), and ΔT is the change in temperature of the water.
Setting the two formulas equal to each other, we get:
m * L = m * c * ΔT
Solving for m, we get:
m = (c * ΔT * m_water) / L
where m_water is the mass of the water in the dog's dish.
Substituting the given values, we get:
m = (4.184 J/g·°C * (27.0 °C - 18.0 °C) * 2500.0 g) / (334 J/g)
m ≈ 289.8 g
Therefore, the mass of the ice cube was approximately 289.8 grams.
P1 = 10 p2=20 v1=100 v2_ solve for v2
Answer:
p1:10 and v1:100
meaning p2 :20 andv2 :200
=200
Which fossil fuel has the highest heating value per pound?A) CoalB) OilC) Natural gas.
The correct answer is A) Coal. Coal has the highest heating value per pound compared to oil and natural gas.
This is due to the fact that coal has a higher carbon content and burns more slowly and steadily than other fossil fuels. To further explain, coal is a black or brown rock-like substance that is composed primarily of carbon.
It is formed over millions of years from the remains of ancient plants that were buried and subjected to high pressure and heat. Coal is typically burned to produce electricity and heat, and it is a primary energy source for many countries around the world.
Oil and natural gas are also fossil fuels, but they have lower heating values per pound than coal. Oil is a liquid petroleum product that is refined from crude oil and is used primarily as a transportation fuel.
Natural gas is a colorless, odorless gas that is primarily composed of methane and is used for heating, cooking, and electricity generation. While these fossil fuels are also important sources of energy, coal has the highest heating value per pound.
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A group of students is given a loop of wire connected to a light bulb and a bar magnet. They are asked to make the light bulb light up. N S Which of the following would cause the light bulb to glow?
a) Leaving the magnet at rest beside the light bulb. b) Moving the magnet next to the light bulb. c) Moving the magnet through the coil of wire. d) Leaving the magnet at rest inside the coil of wire.
The following would cause the light bulb to glow : c) Moving the magnet through coil of wire.
What causes the light bulb to glow?When magnet moves through a coil of wire, it creates changing magnetic field that induces electric current in the wire. This current flows through light bulb, causing it to light up.
Bulbs work by sending electricity through curly tungsten filament. The long, twisting path increases electrical resistance faced by traveling electrons, heating filament to some 3000 K. At that temperature, filament glows with warm yellowish white light.
LED bulb as compared to halogen lamps or incandescent bulbs, has much higher resistance on count of integrated power supply unit. The serial connection of glow lamp clamps the circuit even when the switch is turned off.
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The electric field in a region of space is Ex = -1000 xV/m, where x is in meters. What is the potential difference between xi = −30cm and xf = 60cm? I got -900 but it is wrong.
The potential difference between xi = -30 cm and xf = 60 cm for the given electric field is -135 V.
To find the potential difference follow these steps:
1. Convert the given positions from centimeters to meters: xi = -0.3 m and xf = 0.6 m.
2. Calculate the potential difference using the formula ΔV = -∫(E(x) dx) over the interval [xi, xf].
3. Integrate the electric field function, Ex = -1000 x, with respect to x: ∫(-1000 x dx) = -500 x² + C, where C is the integration constant.
4. Find the potential difference by evaluating the integral at the given points: ΔV = -500 (xf² - xi^2) = -500 (0.6² - (-0.3)^2) = -500 (0.36 - 0.09) = -500 (0.27).
5. Calculate the result: ΔV = -500 * 0.27 = -135 V.
The potential difference between xi = -30 cm and xf = 60 cm for the given electric field is -135 V.
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a tennis player hits a 0.1-kilogram tennis ball with her racket from the north end of a court. her racket was traveling at 65 kilometers per hour. the ball accelerated at a rate of 10 meters per second squared. the ball hits the floor on the south end of the tennis court. the floor sends the ball toward the tennis player's opponent with the same acceleration. how much force did the floor on the south end of the court exert on the ball?(1 point)
The force exerted by the racket on the south end on the ball is 1.2 N.
Mass of the ball , m = 0.1 kg, velocity of the ball, v₁ = 65 km/h = 18.06 m/s. Distance travelled by the ball, S = 23.78.
S = v₁t + 1/2at²
23.78 = 18.06t + 5t²
t = 1.7 s
F = ΔP
F = mv₂ /t, F = 0.1 x 20.83/1.7 and F = 1.2 N.
A push or a pull that an object experiences as a result of interacting with another item is known as a force. some forces are the result of contact interactions (normal, frictional, tensional, and applied forces are examples of contact forces), whilst other forces (gravitational, electrical, and magnetic forces) are the consequence of action-at-a-distance interactions.
Thus, The force exerted by the racket on the south end on the ball is 1.2 N.
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astronauts are spun in a device called a centrifuge as a physical test before they fly in space. with what linear speed would an astronaut need to be spinning in order to experience an acceleration of 3 g's at a radius of 10.0 m?
An astronaut would need a linear speed of 30.6 m/s to be spinning in order to experience an acceleration of 3 g's at a radius of 10.0 m.
The linear speed of an astronaut in a centrifuge in order to experience an acceleration of 3 g’s at a radius of 10.0 m can be calculated using the following equation:
Linear Speed = (Centrifugal Acceleration * Radius)/9.81
Therefore, the linear speed of the astronaut in the centrifuge will be:
Linear Speed = (3 * 10.0 m)/9.81
Linear Speed = 30.6 m/s
This means that an astronaut needs to be spinning at a linear speed of 30.6 m/s in a centrifuge in order to experience an acceleration of 3 g’s at a radius of 10.0 m. This is a physical test that astronauts need to undergo before they are allowed to fly in space.
The centrifuge is designed to simulate the gravitational effects on the body that astronauts experience during a space mission. This is done by spinning the astronaut around a fixed point and applying the centripetal force on them, which is calculated using the equation:
Centripetal Force = Mass * Linear Speed^2/Radius
This force provides an artificial gravitational pull on the astronaut and helps them get used to the acceleration effects they will experience in space. The greater the linear speed and radius, the greater the centrifugal force, and hence the greater the acceleration experienced by the astronaut.
It is important that astronauts get used to the acceleration experienced in space as they will be required to work in the space environment and need to be physically prepared. The centrifuge allows astronauts to become acclimatized to the effects of high acceleration and helps them perform better in space.
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Physics is the branch of science that involves the study of physical phenomena in order to
establish patterns.
false
true
True. In order to develop patterns, the study of physical phenomena is considered to be a part of physics.
Is physics the scientific discipline that studies phenomena?The field of research known as physics studies the interactions between the underlying elements of the cosmos and the structure of matter. Quantum mechanics is used to study very small objects, and general relativity is used to study everything in the universe.
Does a field of physical science that focuses on heavenly phenomena and objects fall under the category of natural science?The study of celestial objects and space in general—basically, everything outside of Earth's atmosphere—is known as astronomy.
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A student was investigating the effect of the size of the current flowing on the strength of an electromagnet
Suggest two important potential variables she would need to control to make her investigation a fair test
Answer:
the student should use the same type and size of iron core for each current level tested
Explanation:
To make the investigation a fair test, the student would need to control for variables that could affect the strength of the electromagnet other than the size of the current flowing through it. Two important potential variables to control are:
The number of turns in the coil: The number of turns in the coil can affect the strength of the electromagnet. More turns in the coil can increase the strength of the electromagnet, and fewer turns can decrease it. Therefore, the student should use the same number of turns in the coil for each current level tested.
The type and size of the iron core: The type and size of the iron core can also affect the strength of the electromagnet. A larger or different type of iron core can increase or decrease the strength of the electromagnet, respectively. Therefore, the student should use the same type and size of iron core for each current level tested
Defferentiate between vector and scalar quantity giving relevannt example in case
A scalar quantity is a quantity that just has magnitude and no direction. Scalars include things like length, mass, speed. But a physical quantity is referred to as a vector quantity if it includes both magnitude and direction.
A number of physical quantities that each express a unique meaning and significance in that context can be used to explain each scientific explanation. A physical quantity is a measurable, quantifiable physical property that carries specific information, according to the definition. Physical quantities can be divided into the scalar and vector categories depending on how dependent they are on direction. These two numbers are used to depict an object's motion.To know more about scalar quantity
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after turning out the light for the night, your head hits the pillow. gradually, your muscles relax and drowsiness occurs. this drowsy yet wakeful state is associated with brain waves. question 25 options: a) alpha b) beta c) theta d) delta
After turning out the light for the night, your head hits the pillow. gradually, your muscles relax and drowsiness occurs. This drowsy yet wakeful state is associated with brain waves: Alpha. The correct option is A.
When turning out the light for the night, your head hitting the pillow signals the body to relax. Muscles loosen and drowsiness begins to set in, creating a state between wakefulness and sleep. This drowsy yet wakeful state is associated with brain waves, specifically alpha.
Alpha waves occur during a relaxed, awake state and are present when the eyes are closed. Beta waves appear during alertness and active thinking. Theta waves are associated with the beginning stages of sleep, but can also be present when an individual is in a relaxed, meditative state. Lastly, delta waves are the slowest brain waves and are only present during deep sleep.
In conclusion, when turning out the light for the night and your head hitting the pillow, your muscles relax and drowsiness occurs. This drowsy yet wakeful state is associated with brain waves, specifically alpha, beta, theta, and delta waves. These waves are categorized by their different frequencies and are associated with different states of consciousness.
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what is the strength of an electric field that will balance the weight of a proton? express your answer in newtons per coulomb to two significant figures.
The strength of an electric field that will balance the weight of a proton is 1.6 x 10^-18 N/C.
The strength of an electric field that will balance the weight of a proton is given by the Coulomb force formula which is F=Eq. Therefore, the electric field strength that balances the weight of a proton is given by:
E=qg
where E is the electric field strength, q is the charge of the proton, and g is the acceleration due to gravity.
Electric field strength (E) = qg
From the Coulomb's law, we know that, q = e = 1.60 x 10^-19 C
Also, the weight of the proton (F) is given by:
F = mg
where m is the mass of the proton and g is the acceleration due to gravity.
Therefore, the value of g is 9.81 m/s^2
Therefore,
F = m * g = (1.67 x 10^-27 kg) * (9.81 m/s^2) = 1.64 x 10^-26 N
Therefore, the electric field strength that balances the weight of a proton is:
E=qg = (1.60 x 10^-19 C) * (9.81 m/s^2) = 1.57 x 10^-18 N/C
Approximately, the electric field strength is 1.6 x 10^-18 N/C
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what characteristic is shared by sunspots, solar flares, and coronal mass ejections? select the two correct responses.
The two correct responses that describe a characteristic shared by sunspots, solar flares, and coronal mass ejections are as follows:
They all are connected to the magnetic activity of the Sun.
They are all associated with the Sun's corona and solar atmosphere.
What are sunspots, solar flares, and coronal mass ejections?
Sunspots are dark areas on the surface of the sun. They have a cooler temperature than the surrounding area because they are regions where the magnetic fields prevent hot, plasma-carrying gases from moving in and out of the sun.
Solar flares are sudden, violent eruptions of energy on the sun's surface that release huge amounts of energy. They are also associated with the magnetic activity of the sun.
Coronal mass ejections (CMEs) are huge eruptions of plasma and magnetic fields from the sun's corona. They can have significant impacts on Earth's magnetosphere, and hence, on electrical power grids, satellite communications, and even GPS systems.
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superman throws a boulder of weight 2200 n at an adversary. what horizontal force must superman apply to the boulder to give it a horizontal acceleration of 13.0 m/s2 ?
Superman must apply a horizontal force of 2918.5 N to the boulder to give it a horizontal acceleration of 13.0 m/s^2.
We can use Newton's second law, which states that force equals mass times acceleration. In this case, the mass of the boulder is not given, so we cannot directly calculate the force. However, we know that weight is equal to mass times the acceleration due to gravity (9.8 m/s^2), so we can use this relationship to determine the mass of the boulder.
[tex]2200 N = m * 9.8 m/s^2\\\Solving for mass, we get:\\\m = 224.5 kg[/tex]
We can use Newton's second law to find the horizontal force:
[tex]F = m * a = 224.5 kg * 13.0 m/s^{2 }= 2918.5 N[/tex]
Therefore, Superman must apply a horizontal force of 2918.5 N to the boulder to give it a horizontal acceleration of 13.0 m/s^2.
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a point mass of 1 grams located 5 centimeters to the left of the origin and a point mass of 3 grams located 7 centimeters to the right of the origin are connected by a thin, light rod. find the center of mass of the system.
The center of mass of the system is located 1.75 centimeters to the right of the origin.
The center of mass of the system can be found using the formula:
x_cm = (m1x1 + m2x2) / (m1 + m2)
Where x_cm is the center of mass, m1, and m2 are the masses of the two-point masses, and x1 and x2 are their respective positions.
Substituting the values given, we get:
x_cm = (1 gram * -5 cm + 3 grams * 7 cm) / (1 gram + 3 grams)
x_cm = (3 grams * 2 cm) / 4 grams
x_cm = 1.5 cm
Therefore, the center of mass of the system is located 1.5 centimeters to the right of the origin.
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A boy is swinging a ball attached to a string in a horizontal circle. What happens If the string snaps?
If the string snaps while a boy is swinging a ball attached to it in a horizontal circle, the ball will move tangentially away from the circle. This is because of the tendency of an object in motion to continue moving in a straight line, according to Newton's first law of motion.
At the moment when the string snaps, the ball is moving at a tangent to the circle, and it will continue to move in that direction due to its inertia. This means that the ball will no longer be moving in a circular path, but rather in a straight line.
The direction and speed of the ball after the string snaps will depend on the exact moment at which the string breaks and the velocity of the ball at that moment. If the boy is swinging the ball with a lot of force, the ball may travel quite far before it comes to a stop. On the other hand, if the boy is swinging the ball with less force, the ball may not travel very far at all before coming to a stop.
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Two charged balloons, one black and one red, are separated by some distance r. The black balloon has 5 times the charge of the red balloon The black balloon exerts a force of F black-red on the red balloon, and the red balloon exerts a force of F red-black on the black balloon. How does the magnitude of F black-red compare to F red-black?
The magnitude of F black-red compared to F red-black 5 times greater.
Gravitational force problemThe force exerted between two charged objects is given by Coulomb's law:
F = k * (q1 * q2) / r^2
where F is the force, k is Coulomb's constant, q1 and q2 are the charges of the two objects, and r is the distance between them.Let's denote the charge on the red balloon as q_red and the charge on the black balloon as q_black. Since the black balloon has 5 times the charge of the red balloon, we can write:
q_black = 5 * q_red
Now let's consider the force exerted by the black balloon on the red balloon. According to Coulomb's law, this force is given by:
F_black-red = k * (q_black * q_red) / r^2
Substituting q_black = 5 * q_red, we get:
F_black-red = k * (5 * q_red * q_red) / r^2
Simplifying this expression, we get:
F_black-red = 5 * (k * q_red^2) / r^2
Similarly, the force exerted by the red balloon on the black balloon is given by:
F_red-black = k * (q_red * q_black) / r^2
Substituting q_black = 5 * q_red, we get:
F_red-black = k * (q_red * 5 * q_red) / r^2
Simplifying this expression, we get:
F_red-black = 5 * (k * q_red^2) / r^2
Comparing the two expressions, we can see that:
F_black-red = 5 * F_red-black
Therefore, the magnitude of the force exerted by the black balloon on the red balloon is 5 times greater than the magnitude of the force exerted by the red balloon on the black balloon.
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How do we know how much gravitational force objects have?
Answer:
understand Newton's second law of motion,F is equal to ma where F is the force ,m is the mass of the object,a is acceleration
Three 21 ohm resistors are wired in parallel, what is the total resistance?
Answer:
7 Ω
Explanation:
Given:
R1 = 21 Ω
The connection is parallel
Since all 3 of the resistors have the same resistance, we can use this formula to find the total resistance of the circuit:
R = R1/n (R1 is the resistance of one resistor and n is the number of resistors)
R = 21/3 = 7 Ω
What type of volcanic material indicates an eruption under water? a) AA flows b) Pyroclastic flows c) Pillow lavas d) Pahoehoe flows. e) Pillow lavas.
The type of volcanic material that indicates an eruption underwater is pillow lavas. So the correct answer is option C or E.
Pillow lavas are igneous rock formations that occur when magma extrudes from a volcano's vent and cools quickly under seawater or other bodies of water. When magma comes into contact with the water, it cools quickly and solidifies into what looks like a pile of stacked pillows. Pillow lavas are a clear indication of an underwater eruption. Pillow lavas are typically found in submarine basaltic volcanoes, which are located near mid-ocean ridges, and can be found in a variety of other underwater volcanic settings.
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an empty balloon sits 10 meters away from a golf ball. jamie wants to increase the gravitational force between the two objects by filling the balloon with a substance and holding it 10 meters away from the golf ball. which substance should jamie use to increase the gravitational force between the balloon and the golf ball the most?
Jamie should use Lead as the substance to increase the gravitational force between the balloon and golf ball the most.
The gravitational force between two objects is influenced by their masses and the separation between them. The gravitational force is calculated using the formula F = G × (m1 × m2) / r², where F is the gravitational force, G is the gravitational constant, m1, and m2 are the objects' masses, and r is the separation between them. Jamie has to either reduce the distance between the items or raise their masses in order to enhance the gravitational pull between the balloon and the golf ball.
The only way to increase the gravitational force since the separation is fixed at 10 meters is to increase the masses of the objects. As a result, Jamie ought to inflate the balloon with something heavy. Jamie may increase the balloon's mass and, as a result, the gravitational pull between the balloon and the golf ball by filling the balloon with lead.
Hence, Jamie should use Lead as the substance to increase the gravitational force between the balloon and golf ball the most.
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in engineering mechanics, the force component v acting tangent to, or along the face of, the section is called the
In engineering mechanics, the force component that acts tangent to, or along the face of, a section is called the shear force.
In engineering mechanics, the shear force is the component of a force that acts tangent to, or along the face of, a section. It is a type of force that arises when two parts of a material or structure are moved in opposite directions, causing the material to deform or break. Shear forces are commonly encountered in the design and analysis of structures, such as bridges and buildings. Engineers need to understand and account for shear forces in their designs to ensure that the structures can withstand the forces they will be subjected to during use. In general, shear forces can be thought of as a type of sliding force, acting parallel to the face of a section.
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Which situations show examples of work occurring? Check all that apply
Examples of work taking place include options 1, 2, and 3.
Work is said to be done when a force causes a displacement in an object in the direction of the force. The following situations are examples of work occurring:
Lifting a box off the ground: The force of lifting the box causes a displacement in the box in the upward direction, which is the same direction as the force applied. Therefore, work is done on the box.
Pushing a car up a hill: The force of pushing the car causes a displacement in the car in the direction of the hill, which is the same direction as the force applied. Therefore, work is done on the car.
Carrying a backpack: Although the backpack may not be moving, work is still being done because the force of carrying the backpack causes a displacement in the person's body in the upward direction.
Holding a heavy object: If a person is holding a heavy object, but not moving it, no work is being done on the object because there is no displacement. However, the person's muscles are still working to maintain the position, which is an example of isometric work.
Therefore, options 1, 2, and 3 are examples of work occurring. Option 4 is not an example of work being done on the object, but it is an example of work being done by the person's muscles.
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1. If the astronaut in the picture has a mass of 100kg, the rock has a mass of 200kg and the rock gains a
velocity of 2 m/s to the right, what velocity does the astronaut gain to the left?
The astronaut gains a velocity of 4 m/s to the left.
What is Velocity?
The unit of velocity is meters per second (m/s) in the International System of Units (SI). Velocity can be positive or negative, depending on the direction of motion. A positive velocity means the object is moving in the positive direction, while a negative velocity means it is moving in the opposite direction.
According to the law of conservation of momentum, the total momentum of the system before the collision is equal to the total momentum after the collision, provided there are no external forces acting on the system.
Let's assume that the astronaut and the rock are initially at rest, so the total momentum before the collision is zero. After the rock is thrown to the right, the momentum of the system is:
P = m1 * v1 + m2 * v2
where m1 and v1 are the mass and velocity of the astronaut, m2 and v2 are the mass and velocity of the rock, and P is the total momentum.
Substituting the values given, we get:
P = 100 kg * v1 + 200 kg * 2 m/s
P = 100 kg * v1 + 400 kg*m/s
Since the total momentum of the system must be conserved, the total momentum after the collision must also be zero. Therefore:
P' = m1 * v1' + m2 * v2' = 0
where v1' and v2' are the final velocities of the astronaut and the rock, respectively.
We know that the rock gains a velocity of 2 m/s to the right, so its final velocity is v2' = 2 m/s. Substituting this into the above equation, we get:
100 kg * v1' + 200 kg * 2 m/s = 0
Solving for v1', we get:
v1' = -4 m/s
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you are riding in a train. since the train car is almost empty, you and your friend are pushing a cart (with almost no friction) back and forth between the front and rear of the car. the train is moving at a speed of 5.4m/s and each time you push the cart, the cart has a speed of 2.4m/s. what is the velocity of the cart relative to the ground when the cart is moving toward the front of the car
The relative velocity of the cart relative to the ground when the cart is moving toward the front of the car is 3 m/s.
Given Data:
Train's speed, v = 5.4 m/s
Cart's speed, u = 2.4 m/s
The relative velocity of the cart relative to the ground when the cart is moving toward the front of the car is to be determined. The velocity of an object in a moving frame is equal to the sum of the velocity of the object relative to the moving frame and the velocity of the moving frame. We know that the velocity of the train, v = 5.4 m/s
When the cart is moving forward, the velocity of the cart is the sum of the velocity of the train and the velocity of the cart relative to the train. Therefore, the velocity of the cart when it is moving toward the front is given as:
v = v_train + v_cart (towards the front)v_cart = v - v_trainv_cart = 5.4 - 2.4v_cart = 3 m/s
Therefore, the relative velocity of the cart relative to the ground when the cart is moving toward the front of the car is 3 m/s.
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one end of a 3.0-m rope is tied to a tree; the other end is tied to a car stuck in the mud. the motorist pulls sideways on the midpoint of the rope, displacing it a distance of 0.25 m. if he exerts a force of 200.0 n under these conditions, determine the force exerted on the car.
The force exerted on the car when motorist is pulling on the midpoint of the 3.0-m rope is 400 N.
The question involves the determination of the force exerted on the car when one end of a 3.0-m rope is tied to a tree; the other end is tied to a car stuck in the mud.
The motorist pulls sideways on the midpoint of the rope, displacing it a distance of 0.25 m. If he exerts a force of 200.0 N. Under these conditions, the force exerted on the car can be calculated as follows;
Since the displacement of the rope is perpendicular to the direction of the applied force, the component of the force perpendicular to the rope's direction must be considered. We can calculate the force perpendicular to the direction of the applied force as follows;
F_perpendicular = F x sinθ
where, F is the force exerted, and θ is the angle between the force and the direction of the rope (90°).
Therefore,
F_perpendicular = 200 x sin(90°) = 200 x 1 = 200 N
The force acting on the car is the force in the direction of the rope, which is equal to two times the force perpendicular to the rope direction. Therefore,
F_car = 2 x F_perpendicular
F_car = 2 x 200 N = 400 N
Therefore, the force exerted on the car is 400 N.
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if the person lets her arm swing freely from an initial position that is straight out and parallel to the ground, when is the angular acceleration of the arm about the shoulder the greatest?
The angular acceleration of the person's arm about the shoulder is the greatest when the arm is at its lowest point during the swing, perpendicular to the ground.
The angular acceleration of the arm about the shoulder will be the greatest when the arm is at its lowest point during the swing, which is perpendicular to the ground.
1. The person's arm starts in an initial position that is straight out and parallel to the ground.
2. As the person allows her arm to swing freely, gravitational force causes the arm to accelerate downward.
3. The force acting on the arm is the weight of the arm, which can be considered to act at its center of mass.
4. As the arm moves downward, the torque (rotational force) about the shoulder joint increases due to the increased force of gravity acting on the arm.
5. The angular acceleration is directly proportional to the torque and inversely proportional to the moment of inertia.
In this case, the moment of inertia remains constant as the arm's mass and length remain the same throughout the swing.
6. Therefore, the angular acceleration of the arm will be the greatest when the torque about the shoulder is the largest.
7. The torque will be the largest when the arm is at its lowest point during the swing, which is when it is perpendicular to the ground.
This is because the force of gravity acting on the arm has the most significant impact at this position.
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g why can we ignore expanding of 13 l steel scuba tank when evaluating the mass of air the tank is filled with? is it a good approximation? explain.
The expansion of a 13L steel scuba tank can be ignored when evaluating the mass of air inside because the volume increase due to expansion is very small compared to the tank's original volume. It is a good approximation.
The expansion of a 13L steel scuba tank occurs due to changes in temperature and pressure. When the tank is filled with air, the air inside the tank is also affected by these changes. However, the volume increase due to expansion is typically very small compared to the original volume of the tank. As a result, the mass of air inside the tank can be evaluated without taking into account the expansion of the tank. This is a good approximation because the expansion is negligible in comparison to the total volume of the tank. However, it's worth noting that if a more precise calculation is required, the expansion of the tank should be taken into account.
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I need help answer please.
Answer:the mass of the water in the bowl when it is placed in the freezer is 0.5 kg.
Explanation:To calculate the mass of the water in the bowl when it is placed in the freezer, we can use the formula:
mass = volume × density
The volume of the water is given as 500 cm³. To convert this to m³, we can use the conversion factor:
1 m³ = 1,000,000 cm³
So, the volume in m³ is:
500 cm³ × (1 m³ / 1,000,000 cm³) = 0.0005 m³
The density of water is given as 1000 kg/m³. Now we can calculate the mass:
mass = 0.0005 m³ × 1000 kg/m³ = 0.5 kg
the current in an electromagnet connected to a 240 v line is 17.5 a. at what rate must cooling water pass over the coil if water temperature is to rise no more than 6.5 k?
To determine the rate at which cooling water must pass over the coil, we need to find the power of the electromagnet and then use the specific heat capacity of water to calculate the required mass flow rate.
Explanation:
Step 1: Calculate the power of the electromagnet.
Power = Voltage x Current
Power = 240 V x 17.5 A = 4200 W
Step 2: Determine the specific heat capacity of water.
The specific heat capacity of water is approximately 4.18 J/(g ·K).
Step 3: Calculate the required mass flow rate.
Power = mass_ flow_ rate x specific_ heat_ capacity x temperature_ rise
4200 W = mass_ flow_ rate x 4.18 J/(g ·K) x 6.5 K
Rearrange the formula to find the mass flow rate:
mass_ flow_ rate = 4200 W / (4.18 J/(g· K) x 6.5 K)
mass_ flow_ rate = 4200 W / (27.17 J/g) = 154.54 g/s
So, the cooling water must pass over the coil at a rate of 154.54 g/s to keep the water temperature rise no more than 6.5 K.
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voltmeter is connected in parallel with loads why?
Answer:A Voltmeter has very high resistance to ensure that it's connection do not alter flow of current in the circuit. Now if it is connected in series then no current will be there in the circuit due to it's high resistance. Hence it is connected in parallel to the load across which potential difference is to be measured.
Explanation: