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A worker pushed a 27 kg block 9.2 m along a level floor at
Chapter , Problem 42(choose chapter or problem)
A worker pushed a 27 kg block 9.2 m along a level floor at constant speed with a force directed 32# below the horizontal. If the coefficient of kinetic friction between block and floor was 0.20, what were (a) the work done by the workers force and (b) the increase in thermal energy of the blockfloor system?
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QUESTION:
A worker pushed a 27 kg block 9.2 m along a level floor at constant speed with a force directed 32# below the horizontal. If the coefficient of kinetic friction between block and floor was 0.20, what were (a) the work done by the workers force and (b) the increase in thermal energy of the blockfloor system?
ANSWER:Step 1 of 3 a) The newton’s second law in the vertical direction is given by, That is, Implies, ...............(1) The newton’s second law in the horizontal direction is given by, Put the value from equation one in the above equation,\n Implies, Given, The coefficient of friction, Mass of the block, The angle, So,