2 years ago

What subjects combine to make the field of physical science?

Physics

1 answer:

Katen [24]2 years ago

3 0

Answer:

Earth science and chemistry

Explanation:

I think so

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Shawn and his bike have a total mass of

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Shawn's kinetic energy is 61.45 J.

Explanation:

Given;

Mass of the system is, $m=52.3\ kg$

Displacement of the bike is, $d=1.6\ km=1.6\times 1000=1600\ m$

Time taken is, $t=17.4\ min=17.4\times 60=1044\ s$

Let the constant velocity be $v$ .

For constant velocity, magnitude of velocity is given as distance by time.

Therefore, $v=\frac{d}{t}=\frac{1600}{1044}=1.533\ m/s$

Now, kinetic energy of a body is given as:

$KE=\frac{1}{2}mv^2$

Here, $m=52.3\ kg,\ v=1.533\ m/s$

$\therefore KE=\frac{1}{2}\times 52.3\times (1.533)^2\\KE=0.5\times 52.3\times 2.35\\KE=61.45\ J$

Therefore, Shawn's kinetic energy is 61.45 J.

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2 years ago

A net force of +15 N changes the momentum of an object by +100 kg-m/s. What is the time over which the force is applied? (please

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As momentum / time = force
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so your answer is 6.7 !!

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