Question

Constants Part A A man pushes on a piano with mass 170 kg ; it slides at constant velocity down a ramp that is inclined at 12.0° above the horizontal floor. Neglect any friction acting on the piano. Calculate the magnitude of the force applied by the man if he pushes parallel to the incline Express your answer with the appropriate units. ValueUnits F-1 Submit Request Answer Part B Calculate the magnitude of the force applied by the man if he pushes parallel to the floor. Express your answer with the appropriate units. | F= 1 Value Units Submit

Answer 1

As the piano is sliding down, the man has to apply force opposite to stop it

Part A

v- constant w.cose

Ff = 0 as no friction

F = wsin@

= mgsin@ = 170x10xsin15 = 440N

Part B

mg sin e mg

f / cos@ = mgsin@ ....

f = mgtan@

= 170x10xtan15 = 455N

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