How much work was done by friction as the block slid from point A to point B? Express your answer in joules.

(a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force F at an angle e with respect to the horizontal. The coefficient of kinetic friction between block and table is u. Is the force exerted by friction equal to u, mg? If not, what is the force exerted by friction? (Assume 0 is measured above the horizontal.) This answer has not been graded yet. (b) How much work is done by the friction force and by F? (Don't forget the signs. Use the following as necessary: F for the magnitude of F, g, m, x, 0 and u,) WE = (c) Identify all the forces that do no work on the block. (Select all that apply.) O friction f OF Cos(e) OF sin(0) O mE (d) Let m = 2.00 kg, x = 4.50 m, 0 = 3.7°, F = 14.5 N, and u, = 0.400, and find the answers to parts (a) and (b). (Include appropriate signs.) We = W =

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A chain of length 11 m and a mass per unit length of 0.6 kg/m initially lies coiled on the ground. Find the work done (in Joules) in raising one end of the chain to a height 15 m above the ground. Use g = 9.81 m/s² for the acceleration due to gravity. Write only the numerical answer in the box below. Do not include the units. To be graded correct, your answer must be correct to three significant digits. This question accepts numbers or formulas. Plot | Help | Switch to Equation Editor | Preview