Question
Asked Jun 12, 2019
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Suppose you use an ideal pulley of the type shown in (see attached image) to support a car engine of mass 140 kg.

(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)

T
T
MA 2
MA 4
MA 3
T
TTTT
T
IN
T
TTT
1/1
T
T
T
T
T
TT
w
(c)
(b)
(a)
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T T MA 2 MA 4 MA 3 T TTTT T IN T TTT 1/1 T T T T T TT w (c) (b) (a)

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Expert Answer

Step 1

  a)

The relation between tension and weight of load is,

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2T %3D тg

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Step 2

Substituting the values,

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2T (140kg9.8m/s' (140kg)(9.8m/s* T= 2 =686N

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Step 3

b)

Force supplied by c...

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F (mg +T)-2T = mg -T

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