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 4.4x10^6 J. What mass of water is used to cool the engine?

The density of a liquid could be found by using

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is