3. Friction depends on what

surfaces in contact.

An elevator rising at a constant speed. What forces are acting on the elevaror? A: Normal and tension B: Gravity and tension C: Normal, gravity, and tension D: Gravity

What is a quantized item? a. Tilt a Whirl b. Accelerating a car c. Staircase d. Ferris wheel e. None of the above

The theory that the Earth's crust and part of the upper mantle are broken into sections that move on a fluid layer of the mantle is called ... A. Continental Drift B. Wegener's Theory C. Sea Floor Spreading D. Plate Tectonics

Chan Hee is inflating a basketball using an air pump. He notices that the pump gets warm as he uses it. What is a good hypothesis that could lead to new experimentation? If there is no air in a basketball, then it is hard to play the game.

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis.

Two football players collide on the field. Before the collision, their total momentum was 450 kgm/s to the north. What is their total momentum after the collision? A. More than 450 kgm/s north B. 450 kgm/s north C. Less than 450 kgm/s north D.

Jane and John Doppler effect

If you combine 430.0 ml of water at 25.00 °c and 140.0 ml of water at 95.00 °c, what is the final temperature of the mixture? use 1.00 g/ml as the density of water. s

While working out, a man performed 200 j of work in 3 seconds. What was his power?

A funnel-shaped low pressure closure