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Stells [14]
3 years ago
10

A scientist observes and records data for the force of gravity between a star and a few different-sized planets. The planets are

all the same distance from the star. Which graph best represents the strength of the gra
W.
X.

Y.
Z.vitational force between the planets and the star?
Physics
1 answer:
user100 [1]3 years ago
3 0

Answer: pppp

Explanation:This pp

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Which statement is true about the thermal energy of an object? Choose the correct answer. 1). Thermal energy is the internal pot
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This thermal energy flows as heat within the box and floor, ultimately raising the temperature of both of these objects.
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You observe a distant galaxy. You find that a spectral line, resulting from an electron transition in hydrogen, is shifted from
alexandr1967 [171]

Answer:

The galaxy is moving away from the observer

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So when we see the light has shifted to the infrarred part of the spectrum, it means the source is traveling away from us, making the light waves we percieve streched and move from visible light to infrarred.

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2 years ago
Having landed on a newly discovered planet, an astronaut sets up a simple pendulum of length 1.38 m and finds that it makes 441
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The period of a simple pendulum is given by:
T=2 \pi  \sqrt{ \frac{L}{g} }
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g= \frac{4 \pi^2}{T^2}L (1)

We already know the length of the pendulum, L=1.38 m, however we need to find its period of oscillation.

We know it makes N=441 oscillations in t=1090 s, therefore its frequency is
f= \frac{N}{t}= \frac{441}{1090 s}=0.40 Hz
And its period is the reciprocal of its frequency:
T= \frac{1}{f}= \frac{1}{0.40 Hz}=2.47 s

So now we can use eq.(1) to find the gravitational acceleration of the planet:
g= \frac{4 \pi^2}{T^2}L =  \frac{4 \pi^2}{(2.47 s)^2} (1.38 m) =8.92 m/s^2
3 0
3 years ago
on the surface of theearth ,the weight of a boy is 400N but on a mountainpeak his weight is 360N,Calculatethe value of ''g' on t
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7 0
3 years ago
Which of the following is an example of kinetic energy?
tresset_1 [31]
B. Sound, because everything else sits still and sound waves move
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3 years ago
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