Question
Asked Dec 16, 2019
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The helicopter view in Figure P1.70 shows two people pulling
on a stubborn mule. Find (a) the single force that is
equivalent to the two forces shown and (b) the force a third
person would have to exert on the mule to make the net force equal to zero. The forces are measured in units of
newtons (N).

F = 120. N
Fo = 80.0 N
75.0°,
60.0°
Figure P1.70
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F = 120. N Fo = 80.0 N 75.0°, 60.0° Figure P1.70

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Expert Answer

Step 1

FBD

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y-axis F, sin75° F sin60° х-ахis F, cos75° F cos60°

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Step 2

Net force acting along horizontal direction

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F = F; cos 60°- F, cos 75° = (120N)cos 60°-(80N)cos 75° = 39.29N

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Step 3

Net force acting along ve...

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F = F, sin 60° + F, sin 75° = (120N)sin 60°+(80N) sin 75° =181.IN

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Physics

Kinematics

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