A 20kg child lifts his 0.5kg ball of the floor to put it away on his bookshelf 1.5 meters above the ground. How much work has he done?

Which statement is NOT an advantage of renewable resources? A They produce clean energy. B They are expensive to collect and transform into energy. C They are safe for the environment. D They replenish quickly.

A racehorse can accelerate from a dead stop to 15 m/s in 9.0 seconds. What is the acceleration of the horse?

Find the missing properties of u, h, and x for water at 120◦ c, v = 0.5 m3 / kg b. water at 100◦ c, p = 10 mpa c. nitrogen at 100 k, x = 0.75 d. nitrogen at 200 k, p = 200 kpa e. ammonia at 100◦c, v = 0.1 m3 / kg

The magnitude of the charge of the electron is: a. Exactly the same as the magnitude of the charge of the proton. b. Much greater than the magnitude of the charge of the proton. c. Zero. d. Much less than the magnitude of the charge of the proton. e.

One difference between mechanical and sound waves is

Inside a stereo speaker, you will find two permanent magnets: one on the cone and one near the cone. True of false?

When a hurricane nears land what causes the most damage

Calculate if an electric hair dryer uses 2,400 j of energy in 2 s, what is its power?

Which of the following choices best represents a potential stressor?

How do you distinguish between speed, velocity, and acceleration?