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md8

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The figure below shows two examples of SHM, labeled A and B. (The vertical axis is marked in increments of 0.2 m and the
1. 1 answer
2. 2,070 views
A 290 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the
1. 5 answers
2. 1,521 views
A 23.0 kg box is released on a 39.0° incline and accelerates down the incline at 0.268 m/s2. Find the friction force impeding
1. 0 answers
2. 615 views

(a) Calculate the force exerted by the man. (290*9.8*sin 30deg)-(290*9.8cos30deg*0.40)=436.5N (b) Calculate the work done by the man on the piano. 284.2*(-0.40)=-1136.8J (c) Calculate the work done by the friction force. -3937.6J (d) What is the work done
this anwer was for a 290kg piano..ma bad!
(c) Calculate the work done by the friction force. -3937.6J (d) What is the work done by the force of gravity? 5684J (e) What is the net work done on the piano? 0J (zeroJ) don't know A & b yet! sorry

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