Question

When a certain spring is stretched a distance I, it exerts a restoring force of magnitude F = 2x N, where r is measured from the point of equilibrium. The potential energy stored in the spring when it is stretched.5 m from equilibrium is: (a).15 J (b).37J (c) 25 J (2).5 J (e) none of these For a block with a mass of 2 Kg to slide 2 m up an incline of 30° without friction, it must have a minimum initial speed of: (a) 9.8 m/s (b) 6.3 m/s (c) 39.2 m/s (d) 4.4 m/s (e) none of these A small disk of radius R, is mounted coaxially with a larger disk of radius R2. The disks are securely fastened to each other and the combination is free to rotate on a fixed axle that is perpendicular to a horizontal table top. A string is wrapped around the larger disk and attached to a block of mass m, on the table. Another string is wrapped around the smaller disk and is pulled with a force F as shown. If there is friction between the table and the block only, the minimum value for the coefficient of friction so that the block does not move is given by, m R2 RF (a) = Rg mg RF (b) = Rimg R2F (c) = R2 F R, mg Rimg RF R2 mg

Answer 1

Sol: of spring = k 26. Here forced teks and f = 2xN So, kic Ik - 2 Now, work done = change in potential energy Ika? تسارع - با z WE { x2x(0-3)? دليا w = 0.255