A 12 kg ball moving at 20 m/s strikes another ball at rest. After a completely inelastic collision, the balls move at 10 m/s. What was the mass of the second ball?

The planet XYZ traveling about the star ABC in a circular orbit takes 24 hours to make an orbit. Assume that the orbit is a circle with radius 89 comma 000 comma 00089,000,000 mi. Find the linear speed of XYZ in miles per hour.

A positively-charged particle is released near the positive plate of a parallel plate capacitor. a. Describe its path after it is released and explain how you know. b.

What is the best energy source of electricity

Which has more thermal energy: lake or a cup of hot chocolate?

Voltage can exist without A. current. B. resistance. C. a closed circuit. D. all of these

Consider the Sun and Earth as a single system. How does the law of conservation of energy apply to this system? A) The energy from the Sun that reaches Earth is destroyed by Earth.

Based on the law of conservation of energy, which statement is false Energy is lost when machines don't work right. We can't add more energy to the universe. We can't destroy energy that exists in the universe.

A 120-g rubber ball is thrown with a speed of 10 m/s at an oncoming 900-kg car which is approaching at 30 m/s, and undergoes a one-dimensional elastic collision with the car.

Name two index fossils. Why are these fossils important to the practice of relative aging?

The equation for water is h2 o2 → h2o. to balance the equation, which coefficient should be placed in front of h2 and h2o?