Suppose a cityblock is 100 meters long and quite steep.If you were to ride a bic

Question

Suppose a cityblock is 100 meters long and quite steep.If you were to ride a bicycle up the hill along a zig-zag pathwhich is 200 meters long, the average force that you must exertis ----- the average force you would exert going straightup the hill . Select an answer from the list below and defend itusing your knowledge of the physics of Work and Energy.

(a) 1/4

(b)1/3

(c)1/2

(d) equal to

For the same hill along the zig-zag path, the energy youmust expend is ------- the energy that you would expend goingstraight up the hill. Select an answer from the list below anddefend it using your knowledge of Physics of Work and Energy.

(a) 1/4

(b)1/3

(c)1/2

(d) equal to

Explanation / Answer

this is the solution.

We have to answer the second part first....
Work=mgh (potential energy gained)
Weather you travel 200 meters to get to the same height or 100m,the work you have to do is still the same.
Also, W=F.S
therefore,F1S1=F2S2
F1*100=F2*200
F2=0.5F1
answer (c) 1/2

for the second part as stated above,
answer (d ) equal to

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