A satellite is in circular orbit 230 km above the surface of the Earth. It is observed to have a period of 89 min. What is the mass of the Earth? (The mean radius of the Earth is 6.38 x 106 m.)

For a spacecraft going from the Earth toward the Sun, at what distance from the Earth will the gravitational forces due to the Sun and the Earth cancel? Earth’s mass: Me = 5.98 x 1024 kg the Sun’s mass: Ms = 1.99 x 1030 kg Earth-Sun distance: r = 1.50 x 1011 m

An object weighs 432 N on the surface of the Earth. The Earth has radius r. If the object is raised to a height of 3r above the Earth’s surface, what is its weight?

A worker pushes a 8.0 kg crate across a level surface with a force of 35.0 N directed at an angle of 25.0° downward from the horizontal. Determine the work done by friction after the crate is pushed 12.0 m if the coefficient of kinetic friction between the crate and the surface is 0.25.

A car of mass 1750 kg accelerates from 0.00 m/s to 35.0 m/s.  What was the net work done on the car? 

p2something.png An object slides a distance d = 9.00 m down an incline of height ∆y = 3.00 m as shown.  Determine the speed of the object at the bottom of the incline if it starts from rest and the coefficient of kinetic friction between the object and the surface is 0.25.

A worker pushes a 8.0 kg crate across a level surface, from rest, with a force of 35.0 N directed at an angle of 25.0° downward from the horizontal. Determine the speed of the crate after the crate is pushed 1.5 m, if the coefficient of kinetic friction between the crate and the surface is 0.25.

p2something.png An object slides a distance d = 9.00 m down a frictionless incline of height ∆y = 3.00 m as shown.  Determine the speed of the object at the bottom of the incline if it starts from rest.

p10(1).png A simple pendulum of length L = 0.75 is pulled back to an angle θ = 35.00 and released.  What is its speed of the pendulum at the bottom of its oscillation?

A child sleds down a 3.5 m tall snowy hill.  Ignoring friction, determine the child’s speed at the bottom of the hill.