Are the objects described here in equilibrium while at rest, in equilibrium while in motion, or not in equilibrium at all? Explain. A 200 pound barbell is held over your head. A girder is lifted at constant speed by a crane. A girder is being lowered into place. It is slowing down. A jet plane has reached its cruising speed and altitude. A box in the back of a truck doesn’t slide as the truck stops.

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Answer 1

Textbook Question

Chapter 6, Problem 1CQ

Are the objects described here in equilibrium while at rest, in equilibrium while in motion, or not in equilibrium at all? Explain.

A 200 pound barbell is held over your head.
A girder is lifted at constant speed by a crane.
A girder is being lowered into place. It is slowing down.
A jet plane has reached its cruising speed and altitude.
A box in the back of a truck doesn’t slide as the truck stops.

Expert Solution & Answer

To determine

The objects given are in equilibrium or not.

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

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01:29

Students have asked these similar questions

Which of the following statements are true of inertia? List all that apply. Inertia is a force. Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity. Inertia is a force which brings all objects to a rest position. All objects have inertia. A more massive object has more inertia than a less massive object. Fast-moving objects have more inertia than slow-moving objects. An object would not have any inertia in a gravity-free environment (if there is such a place). Inertia is the tendency of all objects to resist motion and ultimately stop. In a gravity-free environment (should there be one), a person with a lot of inertia would have the same ability to make a turn as a person with a small amount of inertia.

A porch swing is 4 feet long and supported by chains at either end. The swing weighs 52 pounds. A 160 pound person sits 1 feet from the left end and a 120 pound person sits 1 feet from the right end. What is the tension in the chain on the left end? What is the tension in the chain on the right end?

You are standing inside a stationary bus facing forward. As the bus starts and speeds up slowly, you hold on to the handle above you. What prevents your feet from slipping? You are standing inside a stationary bus facing forward. As the bus starts and speeds up slowly, you hold on to the handle above you. What prevents your feet from slipping? Static friction acts towards the back and prevents the feet from moving. The bus provides the acceleration for the feet and kinetic friction acts towards the back. Static friction acts towards the front and provides the acceleration for the feet.

Answer 2

Textbook Question

Chapter 6, Problem 1CQ

Are the objects described here in equilibrium while at rest, in equilibrium while in motion, or not in equilibrium at all? Explain.

A 200 pound barbell is held over your head.
A girder is lifted at constant speed by a crane.
A girder is being lowered into place. It is slowing down.
A jet plane has reached its cruising speed and altitude.
A box in the back of a truck doesn’t slide as the truck stops.

Expert Solution & Answer

To determine

The objects given are in equilibrium or not.

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

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01:29

Answer 3

Textbook Question

Chapter 6, Problem 1CQ

Are the objects described here in equilibrium while at rest, in equilibrium while in motion, or not in equilibrium at all? Explain.

A 200 pound barbell is held over your head.
A girder is lifted at constant speed by a crane.
A girder is being lowered into place. It is slowing down.
A jet plane has reached its cruising speed and altitude.
A box in the back of a truck doesn’t slide as the truck stops.

Expert Solution & Answer

To determine

The objects given are in equilibrium or not.

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

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01:29

Answer 4

Textbook Question

Chapter 6, Problem 1CQ

Are the objects described here in equilibrium while at rest, in equilibrium while in motion, or not in equilibrium at all? Explain.

A 200 pound barbell is held over your head.
A girder is lifted at constant speed by a crane.
A girder is being lowered into place. It is slowing down.
A jet plane has reached its cruising speed and altitude.
A box in the back of a truck doesn’t slide as the truck stops.

Expert Solution & Answer

To determine

The objects given are in equilibrium or not.

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

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01:29

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

To determine

The objects given are in equilibrium or not.

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

Answer 8

Expert Solution & Answer

To determine

The objects given are in equilibrium or not.

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

To determine

The objects given are in equilibrium or not.

Answer 12

Explanation of Solution

Given Info:

a. A person is holding a 200 pound barbell.

b. A girder is lifted at constant speed by a crane.

c. A girder is lowered into a place. It is slowing down.

d. A jet plane has reached its cruising speed and is at a high attitude.

e. A box in the back of a truck doesn't slide as the truck stops.

a. Static Equilibrium

The barbell is static, and the velocity is also zero as it is at rest.

b. Dynamic Equilibrium

There is no acceleration, but the girder has a constant velocity.

c. Not in equilibrium

As it is slowing down, it means the acceleration has a direction opposite to the direction of motion.

d. Dynamic equilibrium

There is no acceleration, but the plane has a constant velocity.

e. Not in equilibrium

The box slows down as it has negative acceleration or retardation.

Conclusion:

From the above explanation, a, b and d are in equilibrium while c and e are not.

Answer 13

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