4. At the top of a hill, a skater has a gravitational potential energy of 125J. What

is the total kinetic energy at the bottom of the hill of the skater if energy is

conserved?

A 50-kg man is driving his snowmobile at a constant speed. The engine applies a force of 360 N and the coefficient of kinetic friction between the snowmobile and the snow is 0.2. What is the mass of the snowmobile?

A toy truck has a speed of 4 m/s and kinetic energy of 48 J. What is its mass? A. 8 kg B. 4 kg C. 6 kg D. 10 kg

Water droplets tend to have a spherical, round shape. Explain this fact in terms of the polar nature of water molecules.

When you look at a white light through a glass prism, you see a rainbow of colors called a

If a skydiver weighs 800 N, what would air resistance be when he is at terminal velocity?

A car is moving 14.4 m/s when it hits the brakes. It slow from 78.8 m, which take 9.92s. It then accelerates at 1.83 m/s 2 for 4.50 s. What is the total displacement?

Select all of the answers that apply. What conditions on Earth are unique from other planets in our solar system?

Which is a chemical change

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is?

What is the electrical power when the current is 25 amps and the voltage is 10 volts?