Wednesday
April 23, 2014

Homework Help: Physics

Posted by QUESTION on Thursday, August 20, 2009 at 3:04pm.

this one is kind of hard

A bicyclist can coast down a 7.0 degree hill at a steady 9.5 h^-1 km. If the drag force is proportional to teh square fo the speed v, so that Fd = cv^2, calculate

(a) the value fo teh constant c and

(b) the average force that must be applied in order to descend the hill at 25 h^-1 km. The mass of the cyclist plus bicycle is 80.0 kg. Ignore other types of friction.

ok for (a) I got 6.7 x 10^-13 m^-1 kg

for (b) I am completly lost the way it's put you would assume there to be zero acceleration so how are you suppose to solve (b)???

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