3 years ago

When a substance changes state ____ does not change the speed of the molecules?

1 answer:

6 0

I don't understand what you are looking for. I can tell you that the speed of molecules does change during state changing.

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141m

Explanation:

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3 years ago

An object is thrown directly up (positive direction) with a velocity (vo) of 20.0 m/s and do= 0. How high does it rise (v = 0 cm

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Answer:

The value of d is 20.4 m.

(C) is correct option.

Explanation:

Given that,

Initial velocity = 20 m/s

Final velocity = 0

We need to calculate the time

Using equation of motion

$v = u+gt$

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v = Final velocity

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$t = \dfrac{20}{9.8}$

$t= 2.04\ sec$

We need to calculate the distance

Using equation of motion

$s = ut+\dfrac{1}{2}gt^2$

$s=0+\dfrac{1}{2}\times9.8\times(2.04)^2$

$s=20.4\ m$

Hence, The value of d is 20.4 m.

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The are is called a magnetic field.

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Acceleration (magnitude anyway) = (change in speed) / (time for the change) .

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Time for the change = 4.0sec

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