Cuckoo Clock Works
Posted May 18, 2011
By admin
i need help please.explain this to me PLEASE?
1)A man pushes a heavy box across the floor at a constant speed in 0.5m/s by exerting a horizontal force of 150N on it.
a)Explain why the resultant force on the box is zero.
b)What is the distance moved by the box in 8s?
c)How much work is done by the man in 8s?
d)At what rate is the man doing work?
2)In a cuckoo clock with chains and weights,the gradual falling o a mass provides energy to operate the clock mechanism.In a particular clock of his type,the mass of 0.60kg falls through a height of 0.3m in 24 h .Taking g as 10m/s^-2,calculate
a)energy provided by the falling mass in 24h
b)the power generated
3)A bricklayer lifts 50 bricks,each weighing 15N,through a vertical height of 1.2m in one minute and places them at rest on wall.Calculate
a)work done
b) the average power needed
1a) The box is 15 kg which would mean that the box= 150N (15 x 10) would be required to push it. 10N= 1kg on earth because earth's gravitational pull is 10N/kg.
b) 0.5 x 8 = 4m
c) W.D= energy x time = 150 x 8 = 1000J
this stuff is pretty basic kinematics. you should try them yourself
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