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sukhopar [10]
2 years ago
6

How much work is done when a very large force is applied to an object but does not move the object?

Physics
2 answers:
yarga [219]2 years ago
7 0

Answer:

A. None

(took the test)

Ierofanga [76]2 years ago
4 0
                         Work  =  (force) x (distance)

If the distance is zero (the object doesn't move), then it
doesn't matter how great the force is.  The work is still zero.
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Oil is optically denser than water. When sound/light goes from optically denser medium to optically rarer medium, their velocity increase and they moves away for normal.

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The sound wave speeds up and bends

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A stone is thrown vertically upwards with an initial velocity of 20m/sec. Find the maximum height ot reaches and the time taken
MAXImum [283]

Answer:

The height reached is 20m, The time taken to reach 20m is 2 seconds

Explanation:

Observing the equations of motion we can see that the following equation will be most helpful for this question.

v^{2} = u^{2} + 2as

We are given initial velocity, u

We know that the stone will stop at its maximum height, so final velocity, v

Acceleration, a

And we are looking for the displacement (height reached), s

Substitute the values we are given into the equation

0^{2} = 20^{2} + 2(10)s

Rearrange for s

0^{2} -20^{2} =20s

-400=20s

\frac{-400}{20} =s

s = -20 (The negative is just showing direction, it can be ignored for now)

The height reached is 20m

Use a different equation to find the time taken

s = vt - \frac{1}{2} at^{2}

Substitute in the values we have

-20=(0)t - \frac{1}{2} (10)t^{2}

Rearrange for t

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The time taken to reach 20m is 2 seconds

4 0
3 years ago
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