A 250 Kg cast iron car engine contains water as a coolant. Suppose the engines temperature is 35°C when it is shut off. The air temperature is 10°C. The heat given off
by the engine and water in it as they cool to air temperature is 4.4x106 J. What mass of
water is used to cool the engine?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?