A 85 kg skydiver parachutes from a stationary helicopter at a height of 1,200 m above the ground. After the skydiver reaches a predetermined speed, the parachute opens, slowing the skydiver down. With the parachute open, the skydiver reaches a terminal velocity of 3.5 m/s. Calculate the work done by air resistance during the descent from the height of the helicopter to the ground.

A car with mass 1520 kg is traveling down the highway at a speed of 18 m/s when the driver slams on the brakes due to an accident up ahead. The car eventually comes to rest.According to the work-energy theorem the work is related to the change in kinetic energy, Wnet = Δ KE = KEfinal - KEinitial.(a) Using the work-energy relationship, determine how much net work is done on the car from the brakes? Report the magnitude of the the work (positive value) even though the work from brakes will be negative since the car is slowing down._____ J(b) The brakes apply a force of 24000 N to the car in order to make it stop. Using the fact that W = F d and the fact that the you found the work done (magnitude) by the brakes in part (b), determine the stopping distance, d, of the car.____ m

A box of mass 4.0 kg is accelerated from rest across a floor at a rate of 2.0 m/s^2 for 9.0 s . a.) Find the net work done on the box. Express your answer to two significant figures and include the appropriate units. W= ________

What average mechanical power (in W) must a 70.5 kg mountain climber generate to climb to the summit of a hill of height 305 m in 47.0 min? Note: Due to inefficiencies in converting ch energy to mechanical energy, the amount calculated here is only a fraction of the power that must be produced by the climber's body. HINT W Need Help? Read It Watch It

PLEASE WRITE THE ANSER IN 10 MINUTES! The force acting on a particle varies as shown in Figure. Find the work done by the force on the particle as it moves  from x = 0 m to x = 10.0 m. Round off your result to 1 decimal place.

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In 1970 the population of the world was about 3.5 x 10 ^ 9 and about 2 x 10 ^ 20 of work was performed under human control. Find the average power consumption per person in watts and in horsepower (1 year-3.15 x 10's).

A force is given by F = 6x^2 - 5x where F is in Newton (N) and x is in meters. Determine the work done by the variable force from x = 3.0 to 7.0 m.

A conservative force of 22.5 N moves a particle of 1 gram along a circular path, oriented vertically, of diameter 50 cm. What is the work done by the conservative force, in Joules, in one cycle? Assume g = 10 ms ². Round to one decimal.

An object moves in the xy plane in above figure and experiences a friction force with constant magnitude 3.00N, always acting in the direction opposite the objects velocity. Calculate the work that you must do to slide the object at constant speed against the friction force as the object moves along (a) the purple path O to A followed by a return purple path to O, (b) the purple path O to C followed by a return blue path to O, and (c) the blue path O to C followed by a return blue path to O. (d) Each of your three answers should be nonzero. What is the significance of this observation?