please help! I can\'t figure these two physics problems out 1) A house painter s

Question

please help! I can't figure these two physics problems out

1) A house painter stands 3 m above the ground on a 5.1-m-long ladder that leans against the wall at a point 4.7 m above the ground. The painter weighs 627 N and the ladder weighs 123 N. Assuming no friction between the house and the upper end of the ladder, find the force of friction that the driveway exerts on the bottom of the ladder.

magnitude N direction ---Select---away from the walltowards the wall please help! I can't figure these two physics problems out A house painter stands 3 m above the ground on a 5.1-m-long ladder that leans against the wall at a point 4.7 m above the ground. The painter weighs 627 N and the ladder weighs 123 N. Assuming no friction between the house and the upper end of the ladder, find the force of friction that the driveway exerts on the bottom of the ladder.

Explanation / Answer

normal reaction at the lower surface, N = total force = 627 +123

= 750N

angle with the horizontal = 60.5
balancing the torque we get

750 * (4.7/tan(60.5) = 627*1.7/tan(60.5) + 123 * 4.7/(2*tan(60.5) + f*4.7

f = 261.225N

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