Abody of mass 2 kg is moving in the positive x-direction with a speed of 4 m/s collides head on with an another body of mass 3 kg moving in the negative x-direction with a speed of 1 m/s . during collision a loud sound is heard and they both start moving together . the sound energy cannot be greater than :
a) 12 j
b) 14 j
c) 15 j
d) 17.5 j

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?