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.

Cassie
the work done by gravity is mgh so 95*9.8*170=158270 J
Respond to this Question
Similar Questions

Physics
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 the square fo the speed v, so that Fd = cv^2, calculate (a) the value fo the constant c and (b) the … 
physics
How fast must a cyclist climb a 4.0 degree hill to maintain a power output of 0.35 hp? 
Physics
A bicyclist is coasting straight down a hill at a constant speed. The mass of the rider and bicycle is 85.0 kg, and the hill is inclined at 19.0° with respect to the horizontal. Air resistance opposes the motion of the cyclist. Later, … 
PHYSICS
Assuming a total mass of 95kg (bicycle plus rider), what must be the cyclist's power output to climb the same hill at the same speed? 
applied physics
A cyclist and her bicycle have a combined mass75.okg. If the frictional force acting against the of the bicycle is 23.5, what force must the cyclist apply to maintain a constant velocity? 
Physics
A bicyclist is coasting straight down a hill at a constant speed. The mass of the rider and bicycle is 55.0 kg, and the hill is inclined at 16.0° with respect to the horizontal. Air resistance opposes the motion of the cyclist. Later, … 
Physics
A cyclist and her bicycle have a combined mass of 75.0kg. If the frictional force acting against the motion of the bicycle is 23.5N, what force must the cyclist apply to maintain a constant velocity? 
Physics
A cyclist starts from rest and coasts down a 6.5∘{\rm ^\circ} hill. The mass of the cyclist plus bicycle is 95kg{\rm kg} . The cyclist has traveled 270m{\rm m} .What was the net work done by gravity on the cyclist? 
PHYSICS NEED HELP
A bicyclist can coast down a 5° hill at a constant 6.0 km/h. Assume the force of friction (air resistance) is proportional to the speed v so that Ffr = cv. (a) Calculate the value of the constant c. (b) What is the average force that … 
biomechanics
A cyclist is coasting up a hill. At t=0, the cyclist has a velocity of 14.27 m/s. If the acceleration of the cyclist is constant at 1.67 m/s2, how long will it take the cyclist to come to a complete stop?