When a fluid is heated, what changes occur?

It becomes less dense and begins to rise.

It becomes more dense and begins to rise.

It becomes less dense and begins to sink.

It becomes more dense and begins to sink.

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.