9. Three horizontal plastic ropes pull on a box which is stuck on the ground producing vector forces: A, B and C as shown. Find the magnitude and direction of the fourth force that will make the vector sum of the forces zero.

9. Three horizontal plastic ropes pull on a box which is stuck on the ground producing vector forces: A, B and C as shown. Find the magnitude and direction of the fourth force that will make the vector sum of the forces zero.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter4: Dynamics: Force And Newton's Laws Of Motion

Section: Chapter Questions

Problem 41PE: Two muscles in the back of the leg pull upward on the Achilles tendon, as shown in Figure 4.40...

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Concept explainers

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

Question

Answer: 57.2N, 56.3° below x-axis

16
9. Three horizontal plastic ropes pull on a box which is stuck on the ground
producing vector forces: A. B and C as shown. Find the magnitude and
direction of the fourth force that will make the vector sum of the forces zero.
B =40 N
A-50 N
30
60
C-20 N
Figure 20
Ans. 57.2N, 56.3° below -x-axis

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