Why can't the efficiency of a heat engine be 100%?

To test the resiliency of its bumper during low-speed collisions, a 3 690-kg automobile is driven into a brick wall. The car's bumper behaves like a spring with a force constant 8.00 106 N/m and compresses 3.86 cm as the car is brought to rest.

How much work is done when a hoist lifts a 290-kg rock to a height of 7 m?

A person trying to throw a ball as far as possible will run forward during the throw. explain why this increases the distance of the throw

Definition of mechanical weathering

According to the doppler effect, what appears to happen when a light source moves closer to an observer? The waves stretch and frequency appears to decrease. The waves stretch and frequency appears to increase.

Which organization functions to privide clinics and surgeries i developing nations

What role do convection currents play in oceans and the atmosphere?

What causes density currents to form in the mediterranean sea? a. condensation b. evaporation c. transpiration d. upwelling

How long does it take a car to travel 450 km at 75 km/hr

A free-falling golf ball strikes the ground and exerts a force on it