# Physics

posted by Linda

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.

1. Cassie

the work done by gravity is mgh so 95*9.8*170=158270 J

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