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Aleks [24]
3 years ago
8

A rock with a mass of 8 kg falls straight down from a height of 7 m. What work is done?

Physics
1 answer:
fenix001 [56]3 years ago
7 0
F=MA
F=(8 kg)(9.8 m/s)
F= 78.4 N
W=FD
W=(78.4 N)(7 m)
W=548.8 J
How this helps
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An airplane takes off from Dallas Texas to fly to new york city traveling ne for 2,760 km the Same plane returns that day to Dal
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1104 km/hour

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An automobile with a standard differential turns sharply to the left. The left driving wheel turns on a 20-m radius. Distance be
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Explanation:

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In the given case, angular velocity remains same for inner and outer wheel but there is change in linear velocity of inner wheel and outer wheel.

Now, we assume that

         u = linear velocity of inner wheel

and,   u' = linear velocity of outer wheel.

Formula for angular velocity of inner wheel w = ,

Formula for angular velocity of outer wheel w =

Now, for inner wheels

                   w =

                      = \frac{u}{(R - d)}

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If radius of wheel is r it will cover  distance in one min.

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             = \frac{V}{r} \times 0.1532

So, rotation per minute of outer wheel; n' =  

                   = \frac{V}{2 \pi r \times (1 + \frac{0.75}{20})}

                   = \frac{V}{r} \times 0.1651

5 0
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