A clear echo is heard within 0.2 seconds when a person shouts by sitting at the ridge of a hill. Calculate the velocity of sound in air. The distance between the person and the hill is 33.2 m

A car traveling at 25 m/s starts to decelerate steadily. It comes to a complete stop in 8 seconds. What is its acceleration?

How much volume (in cm3) is gained by a person who gains 11.6 lbs of pure fat?

What is an output force? A. the force a simple machine applies to an object B. the applied force on a system C. the net force on a system D. the force a person applies to a simple machine

What is the peak emf generated by rotating a  940-turn,  24  cm diameter coil in the Earth's  5·10-5 

What is the wave speed of a wave that has a frequency of 20 Hz and a wavelength of 30 m?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False

A baseball has mass 0.145 kg. (a) If the velocity of a pitched ball has a magnitude of and the batted ball's velocity is in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bat.