What do i need to know to solve this:(please help me, thanks!)(adsbygoogle = window.adsbygoogle || []).push({});

First they ask me:

a-) A cyclist intends to cycle up a 7.90° hill whose vertical height is 118 m. Assuming the mass of bicycle plus person is 72.0 kg, calculate how much work must be done against gravity.

Which i found was m*g*h(height)= 83345.76 J

What i can't solve is:

b-) If each complete revolution of the pedals moves the bike 5.03 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 35.6 cm.

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# Force, work and tangency

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