The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.
Explanation:
Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.
THE RESPIRATORY SYSTEM - 3/3
11. The epiglottis closes when someone swallows to protect the lungs?
True or False
12. Drinking too much alcohol can cause snoring due to a relaxation in which part of the respiratory system?
uvula
epiglottis
pharynx
larynx
13. What is analogous to the structure of the respiratory system?
an upside-down deciduous tree
the solar system
the Mississippi River, delta, and the Gulf of Mexico
the archipelago of islands that make up Hawaii
14. Which type of disease is characterized by a progressive obstruction of exhalation mechanisms?
pneumonia
COPD
asthma
dyspnea
Answer:
11. true
12.
13. an upside down tree
14. copd
Which statement is true about the reaction shown by this chemical equation?
HCI + NaOH – NaCl + H20
O A. It is exothermic.
O B. It is a synthesis reaction.
O C. It is endothermic.
D. It is a combustion reaction.
SUBMIT
The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.
What is an exothermic reaction?In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.
The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.
From the given reaction,
HCl + NaOH --- NaCl + H₂O
HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.
When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.
When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.
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How are liquids and gases alike?
Answer:
The particles of both states are free flowing and they fill the container that they are in.
Explanation:
Liquids and gases do not have a set formation like a solid does. Liquids have more range of motion and will fill a container (such as how water will fill a glass). Gas has an even wider range of motion and move around very quickly.
ball and bowl system
Answer:
Once the ball is place at the position A and then released, It will accelerate towards the mean position under its weight. At the mean piston it again maximum velocity and momentum so its moves up-to the position B due to inertia. At B it has zero velocity so zero kinetic energy but maximum potential energy.
Again from point B it will move towards O under the restoring Force having maximum velocity at O but does not stop at O due to inertia and will go up to A. In this way the ball will continue to oscillate between the points A and B about the point O, it has simple harmonic motion.
Explanation:
If you want to find stars that are just being born, where are the best places to search?.
Answer:
In giant molecular clouds
Explanation:
To find the stars that are just being born, one of the best places to search is giant molecular clouds.
What is a Star?An astronomical object known as a star is made up of a luminous plasma spheroid that is held together by gravity. The Sun is the star that is nearest to Earth. Other stars are also visible at night with the eye, but because of their great distances from Earth, they appear as stationary points of light.
Many of the brightest stars have names, and the most notable stars have been organized into constellations and asterisms. Star catalogs have been put out by astronomers that list the known stars and provide standardized stellar labels. An estimated 10²²–10²⁴ stars are alive in the observable cosmos.
These stars are all situated within the Milky Way galaxy, with only 4,000 of them being visible with the unaided eye.
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At a distance of 10 km from a radio transmitter, the amplitude of the electric field is 0. 20 volts/meter. What is the total power emitted by the radio transmitter?.
a. 10 kW b. 67 kW c. 140 kW d. 245 kW e. 21 kW
The dwarf planet Pluto was discovered in 1930. Since that time, which jovian planet has completed a full revolution around the Sun?
Answer:
Explanation:
Uranus takes about 84 years to circle the sun.
Pluto's existance has been known for 92 years. Uranius has completed 1 complete revolution. The numbers are reasonably close together and so Uranius is the answer.
A spacecraft flies within 500,000 km of each of these planets. Based on its mass, which planet would gravitationally attract the spacecraft the least?
Answer:
Mars
Explanation:
It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.
I hope it helps! Have a great day!
Anygays-
i is trying to explain why the endoplasmic reticulum is important. Which of these analogies for the e
ulum would best help her with this explanation?
The endoplasmic reticulum is like a set of raw materials used to build bricks.
The endoplasmic reticulum is like a truck that transports newly made bricks out of the factory.
The endoplasmic reticulum is like a factory that helps produce, process, and transport bricks.
The endoplasmic reticulum is like a construction worker that builds a structure with bricks.
Answer:
i will say that the endoplasmic reticulum is a complex organelle that plays a pivotal role in protein and lipid synthesis, calcium storage and stress response
Why is the phase of the moon important for a solar eclipse to occur?.
A circular loop of wire 75 mm in radius carries a current of 113 A. Find the (a) magnetic field strength and (b) energy density at the center of the loop.
The magnetic field strength is 9.47 ×10⁻⁴ T
The energy density at the center of the loop is 0.36 J/m³
Calculating Magnetic field strength & Energy densityFrom the question, we are to find the magnetic field strength
The magnetic field strength of a loop can be calculated by using the formula,
[tex]B = \frac{\mu_{0} I}{2R}[/tex]
Where B is the magnetic field strength
[tex]\mu_{0}[/tex] is the permeability of free space [tex](\mu_{0}=4\pi \times 10^{-7} \ N/A^{2})[/tex]
[tex]I[/tex] is the current
and R is the radius
From the give information,
[tex]R = 75 \ mm= 75 \times 10^{-3} \ m[/tex]
and [tex]I = 113 \ A[/tex]
Putting the parameters into the formula, we get
[tex]B = \frac{4\pi \times 10^{-7} \times 113}{2 \times 75 \times 10^{-3} }[/tex]
[tex]B = 9.47 \times 10^{-4} \ T[/tex]
Hence, the magnetic field strength is 9.47 ×10⁻⁴ T
Now, for the energy density
Energy density can be calculated by using the formula,
[tex]u_{B} = \frac{B^{2} }{2\mu_{0} }[/tex]
Where [tex]u_{B}[/tex] is the energy density
Then,
[tex]u_{B}= \frac{(9.47\times 10^{-4} )^{2} }{2 \times 4\pi \times 10^{-7} }[/tex]
[tex]u_{B} = 0.36 \ J/m^{3}[/tex]
Hence, the energy density at the center of the loop is 0.36 J/m³
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A stone is dropped from the top of a tall building. As it falls in the absence of air resistance, what happens to the de broglie wavelength of the stone?.
Explanation:
lambda = h/mv
hieght is decreasing
velocity is increasing
therfore the wavelength is decreasing.
A ball on the end of a string is revolving at a uniform rate in a vertical circle of radius 97.7 cm. If its speed is 3.74 m/s, and its mass is 0.182 kg, calculate the tension (in newtons) in the string when the ball is at the bottom of the path.
The tension in the string when the ball is at the bottom of the path is 2.61 Newtons.
TensionA tension is simply referred to as a force along the length of a flexible medium such as strings, cable, ropes etc.
Tension in a string revolving can be determined using the expression;
T = mv² / r
Where m is mass of object, v is velocity and r is radius ( length of string )
Given the data in the question;
Mass of ball m = 0.182kgRadius ( length of string ) r = 97.7cm = 0.977mVelocity = 3.74m/sTension in the string; T = ?To determine tension in the string, we substitute our given values into the expression above.
T = mv² / r
T = (0.182kg × (3.74m/s)²) / 0.977m
T = (0.182kg × 13.9876m²/s²) / 0.977m
T = (2.5457432kgm²/s²) / 0.977m
T = 2.61kgm/s²
T = 2.61N
Therefore, the tension in the string when the ball is at the bottom of the path is 2.61 Newtons.
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An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 5.0 cm
Answer:
A V = A X / t where X / t is speed of fluid
A V = area * velocity (rate of fluid flowing)
A1 V1 = A2 V2 form of equation of continuity
pi (D1 / 2)^2 V1 = pi (D2 / 2)^2 V2
V2 = (D1 / D2)^2 * V1 = (8 / 5)^2 * 1.28 m/s = 3.28 km/s
Angie, brad, and carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equal-mass wood and steel blocks resting on a frictionless table. One bullet bounces off the steel block while the second becomes embedded in the wood block. All the masses and speeds are the same, says angie, so i think the blocks will have equal speeds after the collisions. But what about momentum? asks brad. The bullet hitting the wood block transfers all its momentum and energy to the block, so the wood block should end up going faster than the steel block. I think the bounce is an important factor, replies carlos. The steel block will be faster because the bullet bounces off it and goes back the other direction.
Answer:
Momentum must be conserved in the collision.
The steel block must move faster after the collision to preserve momentum.
If the steel block is moving faster it will aso have more kinetic energy.
(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)
The speed of sound in ice, water, and steam is shown.
A 3 column by 4 row table. Column 1 is titled Medium and includes the following entries: Ice, Water, Steam. Column 2 is titled Temperature (degrees Celsius) and includes the following entries: 0, 25, 100. Column 3 is titled Speed of Sound (meters per second) and includes the following entries: 3200 meters per second, 1500 meters per second, 346 meters per second.
What best explains the speed of sound in different states of matter?
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Sound travels slowest in steam because the sound has to move around the gas molecules that are far apart.
Sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy.
Sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.
Answer:
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
Explanation:
The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
What is the effect of sound travel on ice?In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.
As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.
In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.
Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.
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An object with a mass of 2.0 kg accelerates 8.3 m/s? when an unknown force is applied
to it. What is the amount of the force?
Answer:
16.6 NExplanation:
We know the relation :
Force = Mass x AccelerationWe are given that :
Mass = 2.0 kgAcceleration = 8.3 m/s²Hence, on substituting the values in the equation :
F = 2.0 x 8.3F = 16.6 NThe given information is,
→ Mass = 2 kg
→ Acceleration= 8.3 m/s
→ Force = F (in Newton)
Now we have to find the,
→ Amount of force applied to the object.
Formula we use,
→ F = Mass × Acceleration
Then the amount of force will be,
→ F = Mass × Acceleration
→ F = 2 × 8.3
→ [ F = 16.6 N ]
Hence, the amount of force is 16.6 N.
Part B For this activity, you'll analyze the motion of the marked spot on the skateboarder's leg. For each dropdown labeled “cm” or “model cm,” change the option to “Legs.” In each frame containing a plot or table, you can use the buttons at the top of the frame to choose whether it shows a plot (graph) or a table. If it is showing a plot, you can select the y-axis label to choose which measurement to plot. See how to change the graph and table options. Now look at the graphs for the horizontal and vertical displacement of the legs against time. How do the two graphs, x vs. t and y vs. t appear? What can you say about the displacement of the snowboarder?
Answer:
Explanation:
c. By using the Select Data button and the Select Data Source optionExplanation:A scatter plot is a plot which is used to plot the points of the data on the horizontal and the vertical axis also it depicts how one variable is affected by the another. After preparing the scatter plot to enter the data in the scatter plot we need to use the data button and then data source option so that the data could be entered in the scatter plothence, option c is correct
The two graphs, x vs. t and y vs. t that are displacement vs time appear by using the Select Data button and the Select Data Source option.
What is Displacement?Displacement is defined as the change in position of an object. It is a vector quantity and has a direction and magnitude.
A scatter plot is a plot which is used to plot the points of the data on the horizontal and the vertical axis also it depicts how one variable displacement is affected by the another. After preparing the scatter plot to enter the data in the scatter plot we need to use the data button and then data source option so that the data could be entered in the scatter plot.
The two graphs, x vs. t and y vs. t that are displacement vs time appear by using the Select Data button and the Select Data Source option.
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A 3.00 kg bucket of water is raised with an upward acceleration of 2.20 m/s2 from a well by means of an attached rope. What is the tension in the rope
Answer:
F = M a
M = 3 kg
a = 2.2 m/s^2
T = tension in rope
T - M g = M a Where T - M g is the net force on the bucket
T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2 = 36 Newtons
Suppose the sphere is positively charged. Is it attracted to, repelled by, or not affected by the magnet?.
When a positively charged sphere is brought near the north pole of a magnet, the positively charged sphere will be attracted to the magnet.
Positively charged objectWhen a positively charged object is brought near the north pole of a magnet, the positively charged object will be attracted to the magnet beacuse of polarity.
Positively charged metals have the tendency to show the polarization of charges.
Thus, when a positively charged sphere is brought near the north pole of a magnet, the positively charged sphere will be attracted to the magnet. Also, if the south pole is brought near the sphere, the positively charged sphere will repel the magnet.
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(15 points) How many circles do i draw, like in what order
Answer:
U have to draw 3 circles
take a specific point and draw 3 circles of different size from the same point.
One wave on a string is moving toward the right and another is moving toward the left. When they meet in the middle, half of the cycle of the wave from the right overlaps with half of the cycle of the wave from the left. The result is that the string gets flat when the two waves meet. What happened? What will happen after the waves meet?
When the wave meets the condition of interference occurs. The interference effect is the sum of the individual wave amplitudes at each site where more than one wave is present.
What is the interference of waves?The result of two or more wave trains flowing in opposite directions on a crossing or coinciding pathways. This phenomenon is known as the interference of waves.
When two wave pulses are traveling along a string toward each other. They meet and the phenomenon is occur known as interference.
Hence the phenomenon of interference occurs when two wave pulses are traveling along a string toward each other.
One wave on a string is moving toward the right and another is moving toward the left. When they meet in the middle, half of the cycle of the wave from the right overlaps with half of the cycle of the wave from the left.
The result is that the string gets flat when the two waves meet the condition of the interference of wave occurs.
Hence when the wave meets the condition of interference occurs.
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Sodium-24 has a half-life of 15 hours. after 45 hours, how much sodium-24 will remain of an original 50.0-g sample? 5.56 g 6.25 g 16.7 g 25.0 g
Answer:
6.25 gm
Explanation:
1 /2 * 1/2 * 1/2 = 1/8th of the original
50/8 = 6.25 gm
Answer:
its b
Explanation:
trust
A sound wave, generated at a frequency of 440 hertz has a wavelength of 2.3 meters as it travels through a solid material. The approximate speed of the wave is ____ m/sec.
The approximate speed of the sound wave traveling through the solid material is 1012m/s.
Wavelength, Frequency and SpeedWavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
From the wavelength, frequency and speed relation,
λ = v ÷ f
Where λ is wavelength, v is velocity/speed and f is frequency.
Given the data in the question;
Frequency of sound wave f = 440Hz = 440s⁻¹Wavelength of the wave λ = 2.3mSpeed of the wave v = ?To determine the approximate speed of the wave, we substitute our given values into the expression above.
λ = v ÷ f
2.3m = v ÷ 440s⁻¹
v = 2.3m × 440s⁻¹
v = 1012ms⁻¹
v = 1012m/s
Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.
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Question 5 of 10
Why does a patient receive more radiation from a CT scan than from having an X-ray image made?
A. A CT scan involves multiple X-ray images.
B. Higher-frequency rays are used in a CT scan.
C. Fewer X-rays are reflected in a CT scan.
D. The X-rays are more powerful in a CT scan.
Answer: A CT scan involves multiple X-ray images.
Answer: A CT scan involves multiple X-Ray images
Explanation:
I did it and it was correct
A piece of zinc was lying outside and had a temperature of 26 degrees C. Later that day the sun came out and the temperature increased to 36 degrees C. If the piece of zinc is only 0. 15 kg, find the thermal energy. NOTE: Zinc has a specific heat of 380 J/kg degrees C). I need The Equation used and The Answer
Answer: 570 J
Explanation:
The amount of heat gained by the piece of zinc can be calulctaed using ∆Q = mc∆T
=> ∆T = 36-26 = 10°C
m = 0.15 kg, s = 380J/kg/°C
=> ∆Q = 0.15 x 380 x 10
= 570J
Explain what it means when someone says energy can not be created or destroyed.
Answer:
Energy is always reused. Energy cannot be created or destroyed because it always turns into some other type of energy.
Explanation:
if 36 columb of charge pass through a wire in 45 what is it carrying
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Here we go ~
[tex]\qquad \tt \dashrightarrow \:Electric \: \: current = \dfrac{ Charge }{time}[/tex]
[tex]\qquad \tt \dashrightarrow \:E= \dfrac{36 }{45}[/tex]
[tex]\qquad \tt \dashrightarrow \:E= 0.8 \: \: amp[/tex]
HELP PLS HELP. WILL GIVE BRAINLIEST.
You are trying to roll a toy car up a hill and stop at the top without rolling down the other side of the hill. If the car has a mass of 0.5 kg and the hill is 0.07 meters high, how much kinetic energy should you use on the car to move it to the exact top?
Let's see
According to law of conservation of linear momentum
PE=KEKE=mghKE=0.5(9.8)(0.07)KE=4.9(0.07)KE=0.343JKE=343mJAnswer:
0.35 J
Explanation:
This problem requires the Law of Conservation of Energy.
⇒ Potential energy = Kinetic Energy
⇒ mgh = 1/2mv²
⇒ 0.5 x 10 x 0.07 = KE
⇒ KE = 5 x 0.07
⇒ KE = 0.35 J
Throughout the reflection, make sure you have a copy of the student guide and your data tables. use the drop-down menus to complete the statements. in part i, the independent variable was . in part ii, the independent variable changed to . the dependent variable for both part i and part ii was .
Mass, Speed and Kinetic Energy.The independent variable changed to . the dependent variable for both part i and part ii was .
What is kinetic energy?We can solve this by analysing the choices and the relations between variables.
It's worth noting that Kinetic Energy is proportional to both speed and mass. Actually, Kinetic Energy is exactly proportional to those factors, meaning that the more mass or speed, the higher the Kinetic Energy.
Having said that, Part I and Part II must have speed and mass as indendepent variable, because Kinetic Energy depends on them.
Then, in the third question, the answer is Kinetic Energy becase that's the dependent variable in both cases Part I and Part II.
Just to remember, the Kinetic Energy is defined as
[tex]KE=\dfrac{1}{2}mv^2[/tex]
Where you can notice the relation between mass, speed and kinetic energy.
Therefore, the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).
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Answer
the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).
Explanation: