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3 years ago

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what is the answer to the question "Two boys of equal mass go up to the first floor of a building. Boy A takes the stairs, boy B

takes the elevator. Which boy will have more potential energy when they reach the first floor"

1 answer:

weeeeeb [17]3 years ago

4 0

Answer:

e

Explanation:e

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2 years ago

A 2,200-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.40 m before coming into contact

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The magnitude of Force is 8.58×10⁵N and direction is upwards

Explanation:

The work beam does on the pile driver is given by

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$W_{nc}=(KE_{f}-KE_{i})+(PE_{f}-PE_{i})\\W_{nc}=1/2m(vf^{2}-vi^{2})+mg(yf-yi)$

Choosing y=0 at the the level where the driver first contacts the beam and vi=0 at yi=+3.40m and comes to rest again vf=0 at yf= -0.088m

So

$-F(0.088m)=1/2m(0-0)+2,200kg(9.81m/s^{2} )(-0.088m-3.40m)\\-F(0.088)=-75508.224\\F=75508.224/0.088\\F=8.58*10^{5} N$

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3 years ago