Wrecking balls are used to demolish old buildings. A 720 kg steel ball is suspended from a 10-m-long cable on a crane. A hook on the crane slowly pulls the ball back, then releases it. The ball's speed at the lowest point in its arc, just before striking the building, is 4.5 m/s. At the lowest point in the ball's arc, O the tension in the cable is less than mg because the ball is moving down. O the tension in the cable is equal to mg because tension and gravity are the only forces and they balance. O the tension in the cable is greater than mg because there has to be a net upward force. Submit Part B Request Answer What is the tension in the cable when the ball is at its lowest point? Express your answer with the appropriate units. ▸ View Available Hint(s) Submit HA T= Value Units ?

Wrecking balls are used to demolish old buildings. A 720 kg steel ball is suspended from a 10-m-long cable on a crane. A hook on the crane slowly pulls the ball back, then releases it. The ball's speed at the lowest point in its arc, just before striking the building, is 4.5 m/s. At the lowest point in the ball's arc, O the tension in the cable is less than mg because the ball is moving down. O the tension in the cable is equal to mg because tension and gravity are the only forces and they balance. O the tension in the cable is greater than mg because there has to be a net upward force. Submit Part B Request Answer What is the tension in the cable when the ball is at its lowest point? Express your answer with the appropriate units. ▸ View Available Hint(s) Submit HA T= Value Units ?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter7: Rotational Motion And Gravitation

Section: Chapter Questions

Problem 54AP: A 0.400-kg pendulum bob passes through the lowest part of its path at a speed of 3.00 m/s. (a) What...

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Concept explainers

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

Question

Wrecking balls are used to demolish old buildings. A 720 kg steel ball is suspended from a
10-m-long cable on a crane. A hook on the crane slowly pulls the ball back, then releases
it. The ball's speed at the lowest point in its arc, just before striking the building, is
4.5 m/s
Part A
At the lowest point in the ball's arc,
O the tension in the cable is less than mg because the ball is moving down.
O the tension in the cable is equal to mg because tension and gravity are the only forces and they balance.
O the tension in the cable is greater than mg because there has to be a net upward force.
Submit
Part B
What is the tension in the cable when the ball is at its lowest point?
Express your answer with the appropriate units.
► View Available Hint(s)
T =
Request Answer
li μÀ
Submit
Value
Units
?

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