At rest, a 59.0 kg cheetah can run at a top speed of 32.7 m/s, according to this video. In terms of net work (in J), how fast can a cheetah reach its maximum speed? A food Calorie is equal to 4186 J. For the cheetah to reach top speed, how many Calories of net work are needed? Cheetah's body produces a lot of energy, yet the amount calculated here is only a small fraction of what it needs.

The figure below shows a person lifting a box with a mass of 29.8 kg to a height of 1.8 m. Determine the potential energy gained by the the box in Joules.

A cheetah can accelerate from rest to a top speed of 24.8 m/s in 5.2 seconds. The cheetah can continue at this speed for 10 seconds more before it runs out of energy. How far does the cheetah run in total?

A bodybuilder lifts a 350 N set of weights from ground level to a position over his head, a vertical distance of 2.15 m. How much work (in J) does the bodybuilder do? Assume the weights are moved at constant speed.

A student is riding a bicycle at a constant speed of 4.36 m/s on a level road. The mass of the student and bicycle together is 76.5 kg. Assume the friction and drag is 40.6 N. What is the student's metabolic power, in Watts? Use g = 10.0 m/s2.

Fleas have remarkable jumping ability. A 0.55 mg flea, jumping straight up, would reach a height of 30 cm if there were no air resistance. In reality, air resistance limits the height to 20 cm .   What is the flea's kinetic energy as it leaves the ground? Express your answer with the appropriate units. K=?   At its highest point, what fraction of the initial kinetic energy has been converted to potential energy? f=?

Captain America pushes a car out of the way with 1000 N of force. He manages to move it 8 meters. How much work does he do on the car?

A typical human brain has a mass of 1.4 kg, which makes up about 2% of a person's mass. However, the brain requires 20% of the body's power consumption. In essence, the brain requires 10 times as much power as any other organ in the body. The average power output of the human brain is about 2.0 × 10¹ W. Assume that the brain's power output could be converted into mechanical work and calculate how high we could use this power to lift an apple (m = 0.20 kg) in one minute. Number pa Units

How many times could a 70kg person jump rope with the energy contained in one serving of gummy bears? There are 130 calories per serving of gummy bears. Assume the gummy bear energy is converted completely to potential energy and that each jump is 10.0cm high. Calculate the potential energy per jump using PE = mgh where m is the mass of the person in kilograms, g is the gravitational acceleration constant 9.8m/s^2, and h is the height of each jump in meters. Recall that 1 Joule = 1kgm^2/s^2.

A 64.0 kg cheetah accelerates from rest to its top speed of 32.5 m/s. (a) How much net work (in J) is required for the cheetah to reach its top speed?   (b) One food Calorie equals 4186 J. How many Calories of net work are required for the cheetah to reach its top speed? Note: Due to inefficiencies in converting chemical energy to mechanical energy, the amount calculated here is only a fraction of the energy that must be produced by the cheetah's body.