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A crate of a weight of 100 N is held in place on a smooth ramp by a rope parallel to the slope attached to a stake at the top of the ramp. What is the tension in the rope if the angle of inclination of the ramp is 20o?

Which of the following is true about momentum? I. It is a vector. II. It is a product of mass times velocity. III. Impulses are required to change it.  

You and your friend push against a wall. Your friend stops after 10 min, while you push for 5 min longer. Compare the work you and your friend do.

A pendulum is pulled to a height of 1.28 m above the lowest position and released. What is its speed at the level of the lowest position?

A ball hits a wall head on and sticks to it. If instead the ball bounces off the wall with one-half of the original velocity and the collision lasts the same time, the average force on the ball would be _____ times greater.

What is the gravitational potential energy of a 1-kg block at rest on a table 1 m above the floor?

A pole vaulter clears 6.00 m. What is his velocity just before landing?

Two masses in the figure below rest on a smooth table. A force of 14 N is applied on A. What force does B exert on A?

A 150 N sled is being pulled up a 28° rough ramp at constant speed by a force of 100 N parallel to the ramp. With what acceleration will the crate slide down, if it is released at some point on the ramp?

A roller coaster travels around a vertical 8-m radius loop. Determine the speed at the top of the loop if the normal force exerted by the seats on the passengers is equal to ¼ of their weight.