A football travels 25 m in 2.5 seconds. What is the speed of the football?

Why do astronauts feel weightless in space?

Gravitational potential energy is often released by burning substances. true or false

If the momentum of a 1000 kg car travelling at 10 m/s was transferred completely to a 20.0 kg traffic barrier, what would the final speed of the barrier be a. 40 m/s b. 50 m/s c. 250 m/s d. 500 m/s

Which electron transition would result in the greatest amount of energy to be absorbed? a) n = 4 to n = 1 b) n = 1 to n = 4 c) n = 2 to n = 1 d) n = 1 to n = 3 e) None of the choices are correct

Which of the following is the only requirement for an object to be projectile motion? A. The object must have a nonzero vertical acceleration. B. Gravity must be the only force acting on the object. C. The horizontal velocity must be constant. D.

How much power is reqired to lift a 10-n box 2 meters

Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. A 200 kg dolphin leaps straight up to a height of 7.8 m.

An example of renewable energy resource is ... A - uranium B - Wind C - natural gas

The power of a 1.5-volt alkaline cell varies with the number of hours of operation. A brand new D-cell can deliver as much as 13 A through a copper wire connected between terminals. Determine the power of a brand new D-cell.

You measure a watch's hour and minute hands to be 7.4 mm and 12.1 mm long, respectively. Part A In one day, by how much does the distance traveled by the tip of the minute hand exceed the distance traveled by the tip of the hour hand?