Suppose you use an ideal pulley of the type shown in Figure (a) to support a...

Question

Question

Suppose you use an ideal pulley of the type shown in Figure (a) to support a car engine of mass 115 kg.

MA 2 MA 3 MA = 4

(a) What would the tension in the rope be? N

(b) What force must the ceiling supply, assuming you pull straight down on the rope? Neglect the pulley system's mass. N (upward)

Answer 1

Answer #1

a) in the firgure a

balancing the forces on the lower pulley

2T - mg = 0

T = 115 * 9.8/2

T = 563.5 N

the tension in the rope is 563.5 N

b)

at the ceiling

the forces on the ceiling = 3 T downwards

Force on the ceiling = 3 * 563.5

Force on the ceiling = 1691 N

the force on the ceiling is 1691 N

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Answer 2

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