Answer:
C. Temperature of the water.
Explanation:
An independent variable is defined as the variable which is not affected by any other variable in the experiment while also being the variable that is changed and controlled by only the student.
All other stated variables are constant variables, which remain completely unchanged throughout the experiment, in this case the time stirred and the amount of salt, and amount of water.
The set of spectral lines that we see in a star's spectrum depends on the star's (a) atomic structure. (b) chemical composition. (c) rotation rate.
The set of spectral lines that we see in a star's spectrum depends on the star's (b) chemical composition, (d) temperature.
The spectral lines of a star are determined by its chemical composition and temperature. These properties determine the number and type of atoms present in the star's atmosphere. Each type of atom has its own unique set of spectral lines, and the temperature of the star determines the energy level of the atoms, which affects the wavelengths of the spectral lines emitted. The rotation rate and atomic structure of a star do not affect the set of spectral lines we see in its spectrum.
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Salt dissolves in water to form saltwater. Is this considered a chemical change or a physical change
Salt dissolves in water to form saltwater. This kind of change is regarded as a chemical change.
A physical change is a kind of change in which only the physical properties of matter change. In a physical change, neither the composition nor the chemical nature of matter is changed.
A chemical change involves a chemical process that results in the production of new substances. When you dissolve salt in water the sodium chloride dissociates in Na+ and Cl- ions which can be written in the form of a chemical reaction as,
NaCl → Na+(aq) + Cl-(aq)
Thus, dissolving salt in water is an example of a chemical change.
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1. What happens to an atom when it gains electrons? *
Answer: An atom that gains or loses an electron becomes an ion. If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
Answer:
when an atom gains electrons, it gains a negative charge
Explanation:
hope I helped you
a force of 15 N is used to push a box along the floor a distance of 3 meters. find the amount of work done
Answer:
The amount of work done is 45 J.
Explanation:
We know that the force applied is 15N. The amount of displacement experienced by the box is 3 metres along the floor.
Thus, F= 15N
D= 3 metres
The formula for calculating work done is W= F×D
Thus, W=15×3
W=45J
Thus, the amount of work done is 45J.
A coin placed 0.30 m away from the center of a rotating, horizontal turntable just begins to slip when its translational speed is 0.50 m/s. What is the coefficient of static friction between the coin and the turntable
According to the given statement The coefficient of static friction was found to be about 0.0850.
What is static friction ?Static friction is a force that prevents an item from moving. The friction encountered when persons attempt to move a stationary object on a surface without actually causing any relative motion between the body and the surface on which it is located.
The graph below depicts the turntable's constant maximum speed and the centripetal acceleration of the coin.
(a) The centripetal acceleration is caused by static friction.
(b) Using the diagram below,
mai^=fi^+nj^+mg(−j^)
Fy=0nmg, thus n=mg, and Fr=mrv2=f=n=mg
Then, \sμ=rgv²=(30.0cm)(980cm/s2)(50.0cm/s)²
=0.0850
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The complete question is -
A coin placed 30.0cm from the center of a rotating, horizontal turntable slips when its speed is 50.0cm/s. (a) What force causes the centripetal acceleration when the coin is stationary relative to the turntable? (b) What is the coefficient of static friction between coin and turntable?
The figure shows a graph of the output from an AC voltage source.
What is the maximum voltage Vmax of the source?
What is the average voltage Vavg of the source?
What is the root-mean-square voltage Vrms of the source?
From the graph,
Vmax = 3V
Vavg = 2*Vmax/π = 2*3/π = 1.91 V
Vrms = Vmax/√2 = 3/√2 = 2.121 V
Note: The graph that has been considered for theses calculation, is uploaded as an attachment along with the answer.
The sine wave can achieve a maximum value known as VMax for both negative and positive directions. It is VMax for a positive cycle and (-)VMax for a negative cycle.
The average of the instantaneous voltages selected at correctly spaced intervals during the half - cycles of an AC sinusoidal (or other periodic) waveform is the average voltage. The average value is a representation of the area beneath the AC wave form as a function of time.
A sinusoidal origin of electromotive force is described by its root-mean-square (rms) voltage (Vrms), denoted by Vmax/√2.
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A block is resting on an slope. (Figure 3) Which of the following forces act on the block? Check all that apply. O weight O static friction O normal force O kinetic friction O force of push
The correct option is A, B, and C. A block resting on a slope is Weight, static friction, and Normal force.
Static friction is a force that continues an item at relaxation. Static friction definition can be written as: The friction skilled while individuals try to move a desk-bound object on a surface, without surely triggering any relative movement between the frame and the surface on which it's miles.
Static friction is a form of friction force that acts on a body when there's no relative motion between the object and the surface. So, it can act even if the frame is in motion however there should be no relative motion.
A pressure acting on an item is said to be a static force if it no longer exchanges the scale, function, or route of that precise object. The pressure implemented to a structure acts as a load to that precise structure, that is why static force is likewise called a static load.
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Complete Question:
A block is resting on a slope. (Figure 3) Which of the following forces act on the block?
Check all that apply.
A). Weight
B). Static friction
C). Normal force
D). Kinetic friction
E). Force of push
Two long parallel conductors carries I1 and I2 in opposite directions. Determine the magnetic field between the wires
Answer:
B1 = μ_o•I1/2πr
Explanation:
According to the right hand rule, we can say that the magnetic field at the second wire due to the current being carried in first wire is given by;
B1 = μ_o•I1/2πr
Where;
r is distance that separates the two wires
μ_o is a constant known as permeability of free space
I1 is current in wire 1
which one is the lunar eclipse?
Answer:
Yes it would be a lunar eclipse here is an image that I found that might help but during a lunar eclipse when the moon is directly behind earth it will be a full moon
Explanation:
. Suppose a positively charged object A is brought in contact with an uncharged object B in a closed system. What type of charge will be left on object B
Charging by Contact is positive. On object B, a positive charge will remain.
What is Charge?The fundamental physical property of matter, electric charge, exerts a force when kept in an electric or magnetic field. A magnetic field is produced by a moving electric charge, and an electric charge is associated with an electric field. Magnetic and electric fields combine to form the electromagnetic field. The interaction of the charges results in the electromagnetic force, which is the fundamental force in physics. Throughout this session, tell us about electric charges, their types, and their traits.
A scalar quantity is an electric charge. Only when a quantity complies with the laws of vector addition, such as the triangle law of vector addition and the parallelogram law of vector addition, can it be said to be a vector in addition to having a magnitude and direction. In the case of an electric current, the resultant current of these two currents at a junction is an algebraic sum rather than a vector sum. Therefore, despite having magnitude and direction, an electric current is a scalar quantity.
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Two small objects carry the same amount of charge, and the magnitude of the electric force exerted by one object on the other is 0.10 N when they are held 30 mm apart. If the force magnitude increases when the objects are released and free to move, are the objects of the same charge or opposite charge?
The objects must be of opposite charge because the electric force of attraction between them increases when they are released and free to move.
This means that the electric force must be a repulsive force that pushes the objects away from each other. Opposite charges attract and as charges repel, the objects must be of opposite charge for the electric force to increase when the objects are released and free to move.
Therefore when two small objects carry the same amount of charge, the magnitude of the electric force exerted by one object on the other is 0.10 N when they are held 30 mm apart. If the force magnitude increases when the objects are released and free to move, then we can say that they are opposite charges.
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The current in a ________
Answer here
circuit is the same at every point?
Answer:
Series.
Explanation:
Current is the same in each device since there is only a single pathway for the charge to flow.
An artificial satellite is moving in a circular orbit of radius 24,600 km. Calculate its speed if it takes 12hours to revolve around the earth.
Answer:
the speed of the satellite is 12,880.53 km/h
Explanation:
Given;
radius of the circular orbit, r = 24,600 km
time taken to revolve around Earth, t = 12 hours
The circumference of the satellite is calculated as;
L = 2πr
L = 2π x 24,600 km
L = 49,200π km
L = 154,566.36 km
The speed of the satellite;
v = L/t
v = 154,566.36 / 12
v = 12,880.53 km/h
Therefore, the speed of the satellite is 12,880.53 km/h
Escriba una oracion empleada de dos adjetivos de significado opuesto unidos por la exprecion y a la ves
Answer:
El castigo de Juan fue justo y a la vez injusto.
Explanation:
Adjetivos opuestos: justo - injusto
La oración significa que el que castigo era merecido, sin embargo, puede ser algo exagerado por lo tanto algo injusto. Describiendo la situación con adjetivos con significado opuesto al mismo tiempo, mediante un conector de simultaneidad que es y a la vez.
Spring constant problem. What is the formula for k in terms of the period T and the mass?
A. K= 4pi^2m/T^2
B. K= 4*pi^2/mT^2
C. K= 2*pi*m/T
The formula for k in terms of the period T and the mass m in spring constant problem is k = 4π²m/T². The formula applies to a spring-mass system.
What is a spring-mass system?A spring-mass system is a system where a mass of object is attached at the free end of the spring. The system will perform a simple harmonic motion where the oscillations occur periodically. The period of any moving object in that motion can be counted as follows
T = 2π√(m/k)
Where
T = period (s)m = mass of object (kg) k = spring constant (N/m)Find the formula for the spring constant k in terms of T and m!
We use the formula above to find k.
T = 2π√(m/k)
√(m/k) = T/2π
m/k = (T/2π)²
m/k = T²/4π²
k = 4π²m/T²
Hence, the formula for the spring constant in the spring-mass system is k = 4π²m/T². The answer is A.
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The Jendrassik maneuver is sometimes used when a subject needs to be distracted, and usually results in a larger reflex test response. Was this true for you? Explain what happened
he JM will heighten (exaggerate) lower limb tendon reflexes by countering some of the normal descending inhibition the brain sends to the reflex arc.
What happens during the Jendrassik maneuver?A medical technique called the Jendrassik manoeuvre involves the patient clenching their teeth, flexing both sets of fingers into a hook-like shape, and interlocking those sets of fingers. The patellar reflex is then induced by striking the tendon below the patient's knee with a reflex hammer.
When the technique is not being used, the reflex outcome of the same movement is compared to the induced reaction. When a patient is focused on the technique, a bigger reflex reaction is frequently seen: "Afferent activity brought on by such muscle tension may activate a weak or seemingly absent reflex.
This is the actual justification for the procedure, not that it is intended to divert the patient's attention, a common misperception that persists to this day." This result
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Write down whether quantity of potential kinetic and total energy
Potential energy is the power that a thing possesses as a result of where it is in relation to other objects.
What is Potential energy?The earth can pull you down through the force of gravity while doing work in the process, being at the top of a stairwell gives you more potential energy than standing at the bottom.
Two magnets have more potential energy when they are held apart than when they are near to one another. They will migrate near each other and begin working if you let them go.
The force acting on the two objects affects the potential energy formula. P.E. = mgh, where m is the mass in kilograms and g is the acceleration due to gravity, is the formula for gravitational force.
Therefore, Potential energy is the power that a thing possesses as a result of where it is in relation to other objects.
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Which organism would most likely have new gene combinations?
Answer:
a hamster resulting from sexual reproduction
How do you find torque with force and distance?
Torque = force x distance from point of rotation
Torque is a measure of the turning effect of an applied force about a specific point or axis. It is calculated by multiplying the force applied to an object by the distance from the point of rotation to the point where the force is applied. The greater the force or the longer the distance from the point of rotation, the greater the torque. The unit of torque is typically Newton-meters (N·m) in the International System of Units (SI) or pound-feet (lb·ft) in the imperial system. Torque is essential in various fields such as physics, mechanics, engineering and robotics.
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a ball is thrown vertically upwards. After resistance is negligible. What is the variation with tiem fo t of the kinetic energy E_k of hte ball
The variation with time of the kinetic energy E_k of the ball is that it decreases. This is because gravity is acting against the ball and slowing it down, so the kinetic energy is decreasing as the ball slows down.
When the ball is released, the initial kinetic energy, E_k, is given by the equation: E_k = mgh, where m is the mass of the ball, g is the gravitational acceleration, and h is the initial height of the ball. As the ball rises, its height increases, and the potential energy, U, increases. However, this increase in potential energy is at the expense of kinetic energy, so the kinetic energy decreases as the ball rises.
When the ball reaches its maximum height, its kinetic energy is zero as it is at rest. As the ball then begins to fall, its potential energy decreases, and its kinetic energy increases. This is because the ball is falling under the action of gravity, and thus its kinetic energy increases as it accelerates downwards. Overall, the kinetic energy of the ball decreases as it rises and increases as it falls.
This is due to the conservation of energy, which states that the total energy of a system remains constant. As the potential energy increases, the kinetic energy decreases, and vice versa.
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How does the gravitational pull of different objects in space affect other objects in space?
Answer:
Every object in space exerts a gravitational pull on every other.
Explanation:
gravity influences the paths taken by everything traveling through space. It is the glue that holds together entire galaxies. It keeps planets in orbit. It can also cause life-destroying asteroids to crash into planets.
What is the velocity of the particle at time t 0?
The velocity of the particle at t=0 is zero because the particle is in rest position and did not moving at any of the instance or travelling at an uniform speed through out the whole journey or yet did not start from the source point.
Velocity is the rate of change of velocity. At any point on a trajectory, the magnitude of the velocity is given by the rate of change of velocity in both magnitude and direction. Velocity of the body that we can consider is the increasing value of the velocity of any object at a constant rate and that of we can calculate. Hence by the primary information that we have we can formerly consider that the velocity which is acting on the particle at t=0 is zero because the particle is in rest position and did not moving at any of the instance or travelling at an uniform speed through out the whole journey or yet did not start from the source point.
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a -ion (negative ion, one with extra negative charge )
A high diver wants to make sure that she does not move any faster than 32 m/s when she enters the water from a dive. If she leaves the diving board from rest, what is the maximum height the diving board can be above the water (in meters) so that she does not go any faster than 32 m/s
The maximum height the diving board can be above the water is 52.5m, so that she does not go any faster than 32 m/s when she enters the water.
How do you determine the maximum height ?To determine the maximum height the diving board can be above the water, we can use the equation of motion for a freely falling object:
v^2 = u^2 + 2as
where
v = final velocity (32 m/s)
u = initial velocity (0 m/s)
a = acceleration due to gravity (-9.8 m/s^2)
s = distance fallen (height of diving board above water)
We can rearrange the equation to find the distance fallen (s)
s = v^2/(-2a) - u^2/2a
substituting the values
s = 32^2/(-2*(-9.8)) = 32^2/19.6 = (1024/19.6) = 52.5 m
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How much force is needed to accelerate a 63 kg skier at 6 m/s2?
Answer:
378 N
Explanation:
F = ma = (63 kg)(6 m/s²) = 378 N
A skier weighing 63 kg needs 189N of force to accelerate at 6 m/s. The magnitude of the force required to accelerate the sled is 91 newtons.
What is the necessary force to accelerate?An object's acceleration is equal to the net force acting on it divided by its mass, or a = F m, according to Newton's second law of motion. When the object's mass and the net force it is subjected to are known, this acceleration equation can be used to determine its acceleration.
By the second law of Newton, F = ma Add the following numbers:
F=189N F=63kg(2ms 2)
Which two formulas are used to determine acceleration?Formula for acceleration: there are three equations for acceleration:
a = (v_f - v_i) / t;a equals 2 / t2 (d - v_i t)a = F / m ;To learn more about Newton's second law here:
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can some one help me with my last question please i really need help
Answer: yeah for sure but post the picture
Explanation:
Lol
The human ear canal is about 2. 8 cm long and can be regarded as a tube open at one end and closed at the eardrum. What is the frequency around which we would expect hearing to be best when the speed of sound in air is 344. 5 m/s? (hint: find the fundamental frequency for the ear canal. )
The human ear canal is closed at one end. Thus, the fundamental frequency of the given ear canal is 3044.64Hz 3044.64 Hz .
Calculation and Explanation:Under air conduction (AC) excitation, the mean resonance frequency of the human middle ear is estimated to be between 0.8 and 1.2 kHz. The typical resonance frequency under bone conduction (BC) excitation, according to research, is higher, at 1.5–2 kHz.
It is a tube with an open end (the concha section) and a closed end (the tympanic membrane), which responds to a quarter-wave by behaving as a resonator. The resonance frequency is described by the equation F=v/4L, where "v" stands for the speed of sound and "L" for the length of the EAC.
The EAR formula should be used: EAR = (1+ i/n)n - 1. I = Stated interest rate, etc.
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What is the efficiency of a solar cell if 1000 J of solar energy hits the
cell and 200 J are converted into electrical energy?
Answer:
Efficiency = 20%
Explanation:
Given the following data;
Input energy = 1000 Joules
Output energy = 200 Joules
To find the efficiency of the solar cell;
[tex] Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100 [/tex]
Substituting into the formula, we have;
[tex] Efficiency = \frac {200}{1000} * 100 [/tex]
[tex] Efficiency = 0.2 * 100 [/tex]
Efficiency = 20%
convert-73°c to kelvin scale
Answer:
200 K
Explanation:
0 °C = 273 K
-73°C = 273 K - 73 K = 200 K
suggest how the thermal conductivity of a metal depends on its temperature
Answer:
With an increase in temperature, the electrical conductivity of a pure metal decreases. This implies that the thermal conductivity of the pure metal shows little variance with an increase in temperature. However, a sharp decrease is observed when temperatures approach 0K