How do you find the efficiency of a motorized machine given the work input and output?

is using electrolysis to separate water molecules in hydrogen and oxygen atoms, a physical or chemical change?

Gravitational potential energy depends on what two things?

A 1400-kg car traveling east at 25m/s collides with a 1800-kg car traveling at a speed of 20m/s in a direction that makes angle of 40degree south of west. the cars stick together after the collision.

Caves most commonly form in which rock type

A space shuttle is in orbit about the earth at an altitude where the acceleration due to gravity is 8.70 m/s2. What is the shuttle's speed at this altitude? 2.65 * 10 3 m/s 7.45 * 10 3 m/s 7.68 * 10 3 m/s 7.91 * 10 3 m/s

Which of the following statements best describes the current state of understanding regarding the apparent acceleration of the expansion of the universe?

Should young people be allowed to do extreme sports? (give me two reasons why) 1. Opinion: 2. Reason why: 3. Reason why:

A light ray is incident on a reflecting surface. If the light ray makes a "35°" angle with respect to the normal to the surface, what is the exact angle (in degrees) made by the reflected ray relative to the normal?

Reimbursement means that a client is A. able to apply for healthcare insurance and refunded for a partial sum of the payment plan by the state. B.

Meg runs a 10km race in 45 minutes (0.75 hours). What was her speed in kilometers per hour? a. 22 km/hr b. 7.5 km/hr c. 4.5 km/hr d. 13 km/hr