World class speed skaters can skate a 3,000-m course in about 4 minutes.

What is their average speed for this course?

A. 12.5 m/s

B. 1.33 m/s

C. 1.25 m/s

D. 13.3 m/s

When the only force affecting an object is gravity, that object is

The magnitude of the momentum of a runner is 346.5 kg•m/s. If the runner has a speed of 4.5 m/s, what is his mass? A. 73 kg B. 77 kg C. 88 kg D. 82 kg

Which is the term used for a change in the magnitude of the velocity

What will happen to a material made of rubber if struck by lightning

If a vibrating string is made shorter (i. e., by holding your finger on it), what effect does

Children in a tree house lift a small dog in a basket 4.00 m up to their house. If it takes 187 J of work to do this, what is the combined mass of the dog and basket?

What happens to the speed of the particles if the temperature is increased

A 65-year-old male enters the hospital with high blood pressure, damaged lungs, low blood-oxygen concentration, and throat cancer. What are all of these symptoms associated with?

At a certain factory, 340 kg crates are dropped vertically from a packing machine onto a conveyor belt moving at 1.00 m/s. (A motor maintains the belt's constant speed.) The coefficient of kinetic friction between belt and crate is 0.400.

A hydraulic lift is used to lift a heavy box that is pushing down on a 1.5-m2 piston with a force of 1,700 N. What force needs to be exerted on a 0.12-m2 piston to lift the box?