In order to produce a wave that travels along a string at a speed higher than 3 meters per second under the same conditions, the students would need to use string that has a linear density– greater than 8 grams per meter. between 8 grams per meter and 1 gram per meter. less than 1 gram per meter. greater than 1 gram per meter.

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?