Question

My Notes s climbed 4.30 m along the ladder from the botto A 16.0-m uniformladder weighing 490 N rests against a frictionless (a) Find the horizontal and vertical forces the ground exerts on the base Horizontal Force magnitude direction Select Vertical Force magnitude direction -Select (b) If the ladder is just on the verge of slipping when the firefighter ladder and ground? Need Help? Read Masters

Answer 1

A)

Considering lower point of ladder,

F1 (16 sin(63)) = (820 x 4.3 cos(63)) + (490 x 8 cos(63))

Horizontal Force, F1 = 237.12 N

Vertical force, F2 = 490 + 820 = 1310 N

B)

F x 16 sin(63) = (820 x 9.4 cos(63)) + (490 x 8 x cos(63))

F = 370.3 N

Coefficient of friction, u = 370.3/1310 = 0.28

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