3 years ago

What is the gravity between two objects proportional to?

1 answer:

Natasha2012 [34]3 years ago

8 0

The gravitational force between two objects is proportional to their masses and inversely proportional to the square of the distance between their centers.

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What is the mass of an object with a velocity of 24.1 m/s and a momentum of 28.3 kg m/s?

ahrayia [7]

Answer:

1.17427...kg

Explanation:

Assumptions: no friction, no air resistance, no internal resistance, and it is 1 dimensional travel for velocity.

p=mv, where p is momentum, m is mass, and v is velocity

28.3=24.1(m)

divide both sides by 24.1

you get 1.174273859

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3 years ago

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if 500 watts hit the surface of a solar panel every second and it generates 150 watts every second, how efficient is it?

alukav5142 [94]

The electrical efficiency is defined as the ratio between the useful power output and the total power input:
$\epsilon = \frac{P_{out}}{P_{in}}$

In our problem, $P_{out} = 150 W$ (power generated by the solar panel) and $P_{in} = 500 W$ (power hitting the surface of the solar panel), therefore the efficiency of the panel is
$\epsilon = \frac{150 W}{500 W}=0.3$
which corresponds to 30%.

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3 years ago

Why are metals sometimes added to gold?

Komok [63]

Because solo gold isn't strong material. But with admixture it's stronger.

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4 years ago

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Rita places a 2.5 kg block on a frictionless inclined plane that is 30 degrees above horizontal. She applies a horizontal force,

vitfil [10]

Answer:

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