A painter on a ledge?
okay ladies and gentlemen, i need some help with homework. I have no idea how to do this physics problem, i would appreciate some help. here it is…
a painter (mass 61kg) is walking along a trestle, consistiing of a uniform plank (m=20kg l= 6.00m) balanced on two saw horses. each is placed 1.40 m from an end of the plank. a pain bucket (m=4.0kg,diameter 28cm) is placed as close as possible to the right hand edge of the plank while still having the whole bucket in contact with the plank.
question:
a. how close to the right hand edge of the plank can the painter walk before tipping the plank and spilling the paint?
b. how close to the left hand edge of the plank can the painter walk before causing the plank to tip? (hint: as the painter walks toward the right handed edge the plank tips clockwise, what is the force acting upward on the plank from the left hand sawhorse support?)
The question implies you are studying torque. In part a, calculate the torque about the right sawhorse as a function of the position of the painter. Find where that torque becomes zero. For part b, do the same but calculate the torque about the left sawhorse. You want the points where the plank assembly exactly balances on one sawhorse.
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