PROGRESS CHECK:1. The boom of the wall crane 4m long is held at right angles to the wall by a wire that is attachedto the wall 3m above the foot of the boom. If the load lifted is 45000N, find the tension in thewire and the compression force in the boom Neglect the weight of the boom.2. A square is acted upon by the forces of 4, 6, 8, and 12N respectively along the four sides asshown. If the length of the side of the square is 0.5m, what is the resultant torque acting to rotatethe square about an axis through A?|6N4NA12N8N3. Two people carry a heavy electric motor by placing it on a light board 2.00 m in length. Oneperson lifts at one end with a force of 700N, and the other lifts the opposite end with aforce of 500N. What is the weight of the motor, and where along the board is its center ofgravity located? (Note: The center of gravity of an object is the point where the weightpasses through.)4. A uniform ladder 10m long and weighing 350N rests against a smooth wall at an angle of 30°with the wall. A 70ON man stand 6m up from the bottom of the ladder. Find the horizontalforce necessary at the base to keep the ladder from slipping.

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1. The boom of the wall crane 4m long is held at right angles to the wall by a wire that is attached to the wall 3m above the foot of the boom. If the load lifted is 45000N, find the tension in the wire and the compression force in the boom Neglect the weight of the boom.

1. The boom of the wall crane 4m long is held at right angles to the wall by a wire that is attached to the wall 3m above the foot of the boom. If the load lifted is 45000N, find the tension in the wire and the compression force in the boom Neglect the weight of the boom.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter9: Statics And Torque

Section: Chapter Questions

Problem 12PE: Suppose the weight of the drawbridge in Figure 9.34 is supported entirely by its hinges and the...

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Concept explainers

Mechanical Properties of Solids

There are three types of matter- solid, liquid and gas. Out of them, solids have a rigid shaped and size. The intermolecular forces of attractions in solids are greatest. Mechanical properties are the physical properties of a material which it shows, when it is provided with certain amount of force or load. These properties are to be kept in mind for various purposes. When a force is applied to an object, the object may or may not get deformed depending upon its elastic property. But every time the object develops a restoring force against the force applied. This is commonly known as stress. If the object changes its dimensions due to the force applied it develops strain ( which is the ratio of change in dimension to the original dimension).

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PROGRESS CHECK:
1. The boom of the wall crane 4m long is held at right angles to the wall by a wire that is attached
to the wall 3m above the foot of the boom. If the load lifted is 45000N, find the tension in the
wire and the compression force in the boom Neglect the weight of the boom.
2. A square is acted upon by the forces of 4, 6, 8, and 12N respectively along the four sides as
shown. If the length of the side of the square is 0.5m, what is the resultant torque acting to rotate
the square about an axis through A?
|6N
4N
A
12N
8N
3. Two people carry a heavy electric motor by placing it on a light board 2.00 m in length. One
person lifts at one end with a force of 700N, and the other lifts the opposite end with a
force of 500N. What is the weight of the motor, and where along the board is its center of
gravity located? (Note: The center of gravity of an object is the point where the weight
passes through.)
4. A uniform ladder 10m long and weighing 350N rests against a smooth wall at an angle of 30°
with the wall. A 70ON man stand 6m up from the bottom of the ladder. Find the horizontal
force necessary at the base to keep the ladder from slipping.

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