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Aleksandr-060686 [28]
3 years ago
6

A 430 g soccer ball lying on the ground is kicked and flies off at 25 m/s. If the duration of the impact was .01 s, what was the

average force acting on the ball?
Physics
1 answer:
maw [93]3 years ago
4 0
<h2>The average force acting on the ball is 1075 N in the direction of travel of ball.</h2>

Explanation:

Force is given by rate of change of momentum.

Mass of soccer ball = 430 g = 0.43 kg

Initial velocity = 0 m/s

Final velocity = 25 m/s

Change in momentum = 0.43 x 25 - 0.43 x 0

Change in momentum = 10.75 kg m/s

Time taken = 0.01 s

Rate of change of momentum = Change in momentum ÷ Time

Rate of change of momentum = 10.75 ÷ 0.01

Rate of change of momentum = 1075 N

Force = 1075 N

The average force acting on the ball is 1075 N in the direction of travel of ball.

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At what height does a 1000-kg mass have potential energy of 1J relative to the ground?
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Answer:

0.0001 m

Explanation:

Given

M=1000 KG

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H=?

Formula

PE = MGH

H= PE/MG

H=1/1000x9.8

H= 1/9800

or 0.00010204

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Io, a satellite of Jupiter, is the most volcanically active moon or planet in the solar system. It has volcanoes that send plume
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1331.84 m/s

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t = Time taken

u = Initial velocity

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From equation of linear motion

v^2-u^2=2as\\\Rightarrow -u^2=2as-v^2\\\Rightarrow u=\sqrt{v^2-2as}\\\Rightarrow u=\sqrt{0^2-2\times -1.81\times 490000}\\\Rightarrow u=1331.84\ m/s

The speed of the material must be 1331.84 m/s in order to reach the height of 490 km

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3 years ago
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What type of medium (solids, liquids, or gases) do sound waves travel fastest in?
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A projectile is launched from ground level at angle u and speed v0 into a headwind that causes a constant horizontal acceleratio
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Explanation:

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t=\frac{v_0\sin u}{g}

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During this time horizontal range is

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For maximum range \frac{\mathrm{d} R}{\mathrm{d} u}=0

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thus u=\frac{1}{2}tan^{-1}\frac{g}{0.1g}

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