As physics

A cyclist moves along a horizontal road. She pushes on the pedals with a constant power of 250W. The mass of the cyclist and bicycle is 85kg. The total drag force is 0.4V^2, where v is the speed of the cyclist.

i) Calculate the energy provided by the cyclist each minute when the overall efficiency of the cyclists muscles is 65% (in J)
ii) Calculate the drag force and hence the instantaneous acceleration of the cyclist when the speed is 6.0ms-1.
Please help me I had the mark scheme to this but couldn’t understand it so please be clear and write even every single small thing you do and write out full equations with no initials or letters to represent just full words.

  1. 0
  2. 3
asked by pack

Respond to this Question

First Name

Your Response

Similar Questions

  1. physical science

    a cyclist pedals at a constant velocity of 15m.s-1 on a level road. the power delivered by the cyclist is 240W. what is the magnitude of the frictional foce acting against the motion?
  2. Physics

    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
  3. physics

    A cyclist is riding in the positive horizontal direction at 14.8 m/s on a horizontal level surface. He encounters an air resistance force of 50 N. The actions on the pedals by the cyclist cause a backward force of 73 N to be
  4. physics

    Assume a cyclist of weight mg can exert a force on the pedals equal to 0.90 mg on the average. If the pedals rotate in a circle of radius 18 cm, the wheels have a radius of 34 cm, and the front and back sprockets on which the
  5. Physics -- check answers please

    1. A boy pushes a car to slow it down while the car is rolling horizontally down the road. If the boy pushes backwards on the car with 10N of force as the car rolls forward 3.0m, the amount of work done by the boy is: a)-30 b)0
  6. physics

    If each complete revolution of the pedals moves the bike 5.00m 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
  7. physics

    A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s. How much power does this force deliver to the object?
  8. Science

    A cyclist of total mass 85 kg maintains a constant speed up an inclined plane. the plane is inclined at 20 degrees to the horizontal. with frictional force of 120 N. the cyclist covers a distance of 50 m along the inclined plane
  9. Physics

    A med tech student pushes a 30-kg carton of books across the floor of her dormitory by exerting a constant force of 185 N at an angle of 37 degrees with the horizontal. If the opposing force of friction is 70 N, how much work does
  10. 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? If the peak of the hill

More Similar Questions