Professor whitney has a sample of lead and a sample of iron. the samples have equal mass. when whitney heats the samples, the lead reaches a higher temperature than the iron, even though both samples absorbed the same amount of thermal energy. what can whitney conclude from this experiment?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

What is the angular momentum of the bar about the axle?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.