Tap image to zoom Part B Find the friction force on the box. Part C Suddenly a w

Question

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Part B Find the friction force on the box.


Part C Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.30 Part B Find the friction force on the box.


Part C Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.30 Part C Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.30

Explanation / Answer

60 *9.8 - T = 60*a

max static friction force = 0.7*9.8*(83+47) = 891.88 N

when they r not moving a =0

T = 588 N < 891.88

so when they r not moving static frictionforce = T = 588 N

when no gravel

60*9.8 -T = 60*a

T - (0.4*9.8*83) *83*a

a = 1.83 m/s^2

speed = (2*a*2.3)^0.5 = 2.906 m/s

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