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2 years ago

How do you know the force for an acceleration of zero?

Physics

1 answer:

Natali5045456 [20]2 years ago

5 0

F=ma

So a=F/m

if acceleration is zero, resultant force is also zero.

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8. What is the kinetic energy of a car that has a mass of 1000 kg and is moving at a speed of 30 m/s?

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Answer:

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Explanation:

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2 years ago

An object is hung on the end of a vertical spring and is released from rest with the spring 3 unstressed. If the object falls 3.

den301095 [7]

Answer:

The period of the resulting oscillatory motion is 0.20 s.

Explanation:

Given that,

Spring constant $k= 3\ N/m^2$

We need to calculate the time period

The object is at rest and has no elastic potential but it does has gravitational potential.

If the object falls then the the gravitational potential change in to the elastic potential.

So,

$mgh=\dfrac{1}{2}kh^2$

$m=\dfrac{1}{2}\times\dfrac{kh}{g}$

Where,h = distance

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Put the value into the formula

$m=\dfrac{1\times3\times3.42\times10^{-2}}{2\times9.8}$

$m=5.235\times10^{-3}\ kg$

Using formula of time period

$T=\dfrac{1}{2\pi}\times\sqrt{\dfrac{m}{k}}$

Put the value into the formula

$T=\dfrac{1}{2\pi}\times\sqrt{\dfrac{5.235\times10^{-2}}{3}}$

$T=0.20\ sec$

Hence, The period of the resulting oscillatory motion is 0.20 s.

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3 years ago

How do I work out the percentage??

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9 Newtons on the right, because:

Right and left are opposite directions, however, in the same direction.

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3 years ago

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Answer:

I think the law of inertia

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2 years ago