Two boys are sitting face to face on a frictionless surface of ice. Bob has a mass of 20kg and Frank has a mass of 40kg. The two boys push off one another with a force lasting 0.25 seconds. Frank begins sliding to the right at a speed of 3.14 m/s Calculate speed and direction of Bob after the push.

Calculate the magnitude of the force between them during the push off.

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.

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Energy flows from the producer level to the level. is called