A spring has a force constant of 100 N/m and an unstretched length of .07m. One end is attached to a post that is free to rotate in the center of a smooth table, as shown. the other end is attached to a 1 kg disc moving in uniform circular motion on the table, which stretches the spring by .03 m. Friction is negligible. What is the work done on the disc by the spring during one full circle.

Would corn syrup, molasses, or pancake syrup make a good lubricant in a car engine? explain your answer.

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.

Need only answer if you think you know it