For a satellite in a circular orbit around the earth, the gravitational force from the earth on the satellite causes the centripetal acceleration. We've seen that work can sometimes be used to store energy as potential energy. Use what you know about *gravitational potential energy* to find the amount of work done by the gravitational force from the earth on the satellite. (Hint: Start by drawing a diagram.)

A 70 kg person climbs a 2.0 m high flight of stairs within 8 seconds when he walks and 2 seconds when he runs up the stairs. What is the work done by the person as he runs up the stairs280 J560 J1372 J10976 J

Samantha is on her bicycle, at the top of a 25 m hill. If Samantha and the bicycle have a combined mass of 73 kg, what is her gravitational potential energy at this point?

A 4.0 kg object is raised 7 meters above the ground (on the earth).  How high would the object have to be raised above the surface of the moon (g = 1.6 N/kg) to have the same amount of potential energy.  Use gEhE=gMhM

A 0.607 kg book is lifted from the floor and placed on a shelf 1.94 m high. What is the increase in gravitational potential energy of the book?

A 2 kg object is thrown downward on an incline with initial velocity of 5m/s. After 12 meter displacement, its velocity becomes 8m/s. What is work done on the object by friction during the motion? (friction is between object and inclined surface). (Please type all steps of your solution and show the formulas you have used.)

What is the gravitational potential energy of a 230 g bird flying 1 km off the surface of the earth?

How much potential energy does a person of mass 92 kg have if they are standing at the top of a building that is 56.2 m high? Submit your answer in exponential form.

A 1000 kg car traveling at 40 m/s slows to 15 m/s. What is the initial kinetic energy of the car? What is the final kinetic energy of the car? How much work is done on the car in slowing it down? What force does the work on the car?  As solved when asked in a different question, I know that the initial kinetic energy is 800,000 J, the final kinetic energy is 112,500 J, and the work is -687500 J. How ever i still need the force.

The figure below depicts a roller coaster track. The roller coaster car has a mass of 166 kg, and the heights of the two hills are h1 = 33.4 m and h2 = 13.1 m. At point A, the roller coaster car has a speed of 9.52 m/s. What is the car's kinetic energy (in Joules) at point C? Friction and air resistance can be neglected.