2 years ago

What is Newton's universal law of gravitation

Physics

1 answer:

quester [9]2 years ago

6 0

Answer:

an object that is in motion wont go out of motion until there is another force pushing on it

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Does rust have the same properties as iron?

spayn [35]

Answer:

This is a chemical property. If iron does rust, this is a slow chemical change since rust is an iron oxide with different properties than iron metal.

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3 years ago

A physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously shouts help.

GrogVix [38]

Answer:

$H = 532 m$

Explanation:

When teacher falls into the cliff then she shout for Help at the same time

so here we know that sound will go down and reflect back up

so here in 3 s distance traveled by the sound

$d = vt$

$d = 340 \times 3$

$d = 1020 m$

now in the same time the distance that teacher will fall down is given as

$d_1 = \frac{1}{2}gt^2$

$d_1 = \frac{1}{2}(9.81)(3^2)$

$d_1 = 44.1 m$

now total distance traveled by teacher and sound in 3 s

$d_{total} = d + d_1$

$d_{total} = 1020 + 44.1$

this total distance must be equal to twice the height of the cliff

$2H = 1064.1 m$

$H = 532 m$

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3 years ago

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Modern vehicles are designed ________ in a crash to absorb kinetic energy?

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Modern vehicles are designed to crush or crumple to absorb kinetic energy.

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3 years ago

Briefly explain how an electric motor works.

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You put electricity into it at one end and an axle (metal rod) rotates at the other end giving you the power to drive a machine of some kind.

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What is the connection between change in momentum and impulse

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The change in momentum of an object equals the impulse applied to it

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3 years ago