3 years ago

D

Physics

1 answer:

GenaCL600 [577]3 years ago

7 0

Answer:

I don't know about these problems

Explanation:

I don't know about these problems at all.

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The density of mercury is 13.6 g/ml. what is its density in lbs/L

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Answer:

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Explanation:

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A theory is a hyothesis that has been varified by multiple investigations. <br> True or false

irakobra [83]

<span>A theory is a hyothesis that has been varified by multiple investigations.

true</span>

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an object near the surface of a planet falls 54m in 3s. what is the acceleration due to gravity on that planet

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mihalych1998 [28]

Answer: 16N

Explanation:

Given that:

mass of box M= 2 kg

Initial speed V1 = 4 m/s

Final speed V2 = 8 m/s

Time taken T= 0.5 s

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Now, recall that Force is the rate of change of momentum per unit time

i.e Force = momentum / time

Hence, F = M x (V2 - V1)/T

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F = 2kg x (4 m/s / 0.5s)

F = 2kg x 8 m/s/s)

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3 years ago

A hypothetical planet has a mass of one-half that of the earth and a radius of twice that of the earth.

Fed [463]

<h2>Option A is the correct answer.</h2>

Explanation:

Acceleration due to gravity

$g=\frac{GM}{r^2}$

G = 6.67 × 10⁻¹¹ m² kg⁻¹ s⁻²

Let mass of earth be M and radius of earth be r.

We have

$g=\frac{GM}{r^2}$

Now

A hypothetical planet has a mass of one-half that of the earth and a radius of twice that of the earth.

Mass of hypothetical planet, M' = M/2

Radius of hypothetical planet, r' = 2r

Substituting

$g'=\frac{GM'}{r'^2}\\\\g'=\frac{G\times \frac{M}{2}}{(2r)^2}\\\\g'=\frac{\frac{GM}{r^2}}{8}\\\\g'=\frac{g}{8}$

Option A is the correct answer.

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3 years ago