Posted by Linda on Tuesday, November 16, 2010 at 2:20am.
A cyclist intends to cycle up a 7.5 degree hill whose vertical height is 170 m.
Assuming the mass of bicycle plus cyclist is 95 kg, calculate how much work must be done against gravity.
If each complete revolution of the pedals moves the bike 5.6 m along its path, calculate the average force that must be exerted on the pedals tangent to their circular path. Neglect work done by friction and other losses. The pedals turn in a circle of diameter 39 cm.

Physics  Cassie, Thursday, November 18, 2010 at 11:31am
the work done by gravity is mgh so 95*9.8*170=158270 J