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You need to login to ask any Questions from chapter Equilibrium-of-a-Rigid-Body of Engineering-Mechanics

Chapter:

Equilibrium-of-a-Rigid-Body

1. Find force in member RP of frame shown below.

$Find force in member RP of frame shown below.\r\n$

707.1N 500N 505N 784N

500N

The direction of unknown is not known to us. To know direction of unknown force we take assumption of it. That is we assume that particular direction might be direction of force and n we do calculations accordingly. And n we apply equilibrium equations to joints.

Hint Answer

2. Find force in member RQ.

$Find force in member RQ.\r\n$

750N 450N 250N 200N

450N

The direction of unknown is not known to us. To know direction of unknown force we take assumption of it. That is we assume that particular direction might be direction of force and n we do calculations accordingly. And n we apply equilibrium equations to joints.

Hint Answer

3. Find force in member QR.

$Find force in member QR.\r\n\r\n\r\n$

300N 800N 500N 400N

800N

The direction of unknown is not known to us. To know direction of unknown force we take assumption of it. That is we assume that particular direction might be direction of force and n we do calculations accordingly. And n we apply equilibrium equations to joints.

Hint Answer

4. A truss is facing a two force member and both of m are in opposite directions. And truss is in equilibrium. And both of m are coming towards each or. The forces are called ______

Compressive forces Tensile Forces Parallel and collinear forces with same direction of heading The rotational forces

Compressive forces

If two forces are in opposite directions. And both of m are coming towards each or. And are collinear too. Then truss is getting a compressive stress. As forces are trying to decrease length of truss. Hence if two force members are in such conditions forces are compressive forces.

Hint Answer

5. The magnitude of resultant of two vectors is always:

Greater than one of the vector’s magnitude Smaller than one of the vector’s magnitude Depends on the angle between them Axis we choose to calculate the magnitude

Depends on the angle between them

Yes, magnitude of resultant of two vectors always depends on angle between m. It might be greater or smaller than one of vector?s length. For perfectly saying, it does depends upon angle between m.

Hint Answer

6. The magnitude of unknown force can’t be known. But direction can be founded out.

The first part of the statement is false and other part is true The first part of the statement is false and other part is false too The first part of the statement is true and other part is false The first part of the statement is true and other part is true too

The first part of the statement is false and other part is true

The first part is wrong. We can determine magnitude of unknown force. It can be done by using equilibrium equations. That equating forces zero, of three different axis. Thus making components of unknown founded out.

Hint Answer

7. To design space trusses which of following rules is followed?

All the loads are applied by the use of cables The loads are applied at the joints All the loads are not applied at the joints The loads are not applied at all to the joints

The loads are applied at the joints

The set of rules which are used to design trusses are having various rules. To m, one is that loads are applied at joints. This is done with neglecting of weight of trusses section.

Hint Answer

8. Why determination of support reaction needs to be done before isolating section?

This reduces the calculation and also the labour This makes the isolated section more complicated This results in reduction on the formulas used This procedure is not done at all, it of no need

This reduces the calculation and also the labour

The determination of force of unknown element is done by method of section. For this section is isolated from main structure and n calculation is done after. But before that determination of support reaction needs to be done.

Hint Answer

9. The forces acting on joints and on members are determined by simple equilibrium equations, which are used in usual beams and trusses.

True False

True

The forces acting on joints and on members are determined by simple equilibrium equations, which are used in usual beams and trusses. The forces which are acting over joint of frames and machines are no more different from forces acting on beams and trusses.

Hint Answer

10. Which of following is correct?

To know the direction of the unknown force we take the assumption of it The direction of the unknown force is known to us already The direction of the unknown can’t be determined The direction of the unknown is of no use, it is not founded

To know the direction of the unknown force we take the assumption of it

The direction of unknown is not known to us. To know direction of unknown force we take assumption of it. That is we assume that particular direction might be direction of force and n we do calculations accordingly.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Engineering-Mechanics

Force Vectors

Equilibrium of a Particle

Equilibrium of a Particle

Force System Resultants

Force System Resultants

Equilibrium of a Rigid Body

Equilibrium of a Rigid Body

Structural Analysis

Structural Analysis

Internal Forces

Internal Forces

Friction

Centre of Gravity and Centroid

Centre of Gravity and Centroid

Moments of Inertia

Moments of Inertia

Principle of Virtual Work

Principle of Virtual Work

Topics

This Chapter Equilibrium-of-a-Rigid-Body consists of the following topics

Structural Analysis

Find force in member RP of frame shown below.

$Find force in member RP of frame shown below.\r\n$

;

Find force in member RQ.

$Find force in member RQ.\r\n$

;

Find force in member QR.

$Find force in member QR.\r\n\r\n\r\n$

;

A truss is facing a two force member and both of m are in opposite directions. And truss is in equilibrium. And both of m are coming towards each or. The forces are called ______

The magnitude of resultant of two vectors is always:

The magnitude of unknown force can’t be known. But direction can be founded out.

To design space trusses which of following rules is followed?

Why determination of support reaction needs to be done before isolating section?

The forces acting on joints and on members are determined by simple equilibrium equations, which are used in usual beams and trusses.

Which of following is correct?

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