Study the graph. The graph shows the displacement of a bicycle during a short race. What is the velocity of the bike during this time?

Idon’t quite understand this problem

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)