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Sam is standing in an empty auditorium. He yells and hears his voice echo. What is happening to the sound to cause this echo?

a 0.145 kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. if the contqct time bewteen bat and ball is 3.00x10^-3 calculate the average force between the bat and ball during contact

Ho Chi Minh led the Communist forces in Indochina and in North Vietnam. a. True b. False User: Hitler and Mussolini headed two of the Axis powers of World War II. a. True b. False

A sound system is being set up in a gazebo in a park. It needs to produce music so that everyone can hear it.

A copper wire of length 16 cm is in a magnetic field of 0.19 T. If it has a mass of 9.0 g, what is the minimum current through the wire that would cause a magnetic force equal to its weight?

After falling for 3 seconds, an object will be falling downwards at what rate?

Which statement is NOT true? Light travels with or without a medium Light travels faster than sound Sound must have a medium to travel through Both light and sound must have a medium to travel through

When light bends as it enters a different medium the process is known as what?

Work out the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s.

Suppose a block moves across a rough horizontal surface at constant speed under the action of a horizontal 3-N force. Which statement concerning this situation is not true? a. There is more than the 3-N horizontal force acting on the block. b.

A m = 2.45 kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a F W = 18.9 N horizontal force. Find the magnitude of the tension in the rope and the rope's angle from the vertical.