Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 11: Problem 4

Which of the following are in static equilibrium? a) a pendulum at the top of its swing b) a merry-go-round spinning at constant angular velocity c) a projectile at the top of its trajectory (with zero velocity) d) all of the above e) none of the above

Short Answer

Expert verified
a) A pendulum at the top of its swing b) A merry-go-round spinning at constant angular velocity c) A projectile at the top of its trajectory (with zero velocity) d) All of the above e) None of the above Answer: e) None of the above

Step by step solution

01

Scenario A: A pendulum at the top of its swing

In this scenario, the pendulum is at the top of its swing, which means that it is momentarily at rest. However, gravity is still acting on the pendulum, causing a downward force. Since there is a net force acting on the pendulum (gravity), it is not in static equilibrium.
02

Scenario B: A merry-go-round spinning at constant angular velocity

In this case, the merry-go-round is spinning at a constant angular velocity, which means there is no net torque acting on it (since it's not accelerating). However, it is not in translational equilibrium since it is constantly moving (rotating). Therefore, this scenario is not in static equilibrium.
03

Scenario C: A projectile at the top of its trajectory (with zero velocity)

At the top of its trajectory, a projectile has zero velocity, which means it is momentarily at rest. However, just like in scenario A, gravity is still acting on the projectile, causing a downward force. This results in a net force acting on the object, and hence, this scenario is also not in static equilibrium.
04

Conclusion

After analyzing all the given scenarios, it's clear that none of them are in static equilibrium. Consequently, the correct answer is option e) none of the above.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A boy weighing \(60.0 \mathrm{lb}\) is playing on a plank. The plank weighs \(30.0 \mathrm{lb}\), is uniform, is \(8.00 \mathrm{ft}\) long, and lies on two supports, one \(2.00 \mathrm{ft}\) from the left end and the other \(2.00 \mathrm{ft}\) from the right end. a) If the boy is \(3.00 \mathrm{ft}\) from the left end, what force is exerted by each support? b) The boy moves toward the right end. How far can he go before the plank will tip?

A 600.0-N bricklayer is \(1.5 \mathrm{~m}\) from one end of a uniform scaffold that is \(7.0 \mathrm{~m}\) long and weighs \(800.0 \mathrm{~N}\). A pile of bricks weighing \(500.0 \mathrm{~N}\) is \(3.0 \mathrm{~m}\) from the same end of the scaffold. If the scaffold is supported at both ends, calculate the force on each end.

A \(5.00-\mathrm{m}\) -long board of mass \(50.0 \mathrm{~kg}\) is used as a seesaw. On the left end of the seesaw sits a 45.0 -kg girl, and on the right end sits a 60.0 -kg boy. Determine the position of the pivot point for static equilibrium.

A \(100 .-\mathrm{kg}\) uniform bar of length \(L=5.00 \mathrm{~m}\) is attached to a wall by a hinge at point \(A\) and supported in a horizontal position by a light cable attached to its other end. The cable is attached to the wall at point \(B\), at a distance \(D=2.00 \mathrm{~m}\) above point \(A\). Find: a) the tension, \(T,\) on the cable and b) the horizontal and vertical components of the force acting on the bar at point \(A\).

A uniform rectangular bookcase of height \(H\) and width \(W=H / 2\) is to be pushed at a constant velocity across a level floor. The bookcase is pushed horizontally at its top edge, at the distance \(H\) above the floor. What is the maximum value the coefficient of kinetic friction between the bookcase and the floor can have if the bookcase is not to tip over while being pushed?
See all solutions

Recommended explanations on Physics Textbooks

Rotational Dynamics

Read Explanation

Linear Momentum

Read Explanation

Thermodynamics

Read Explanation

Famous Physicists

Read Explanation

Work Energy and Power

Read Explanation

Further Mechanics and Thermal Physics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free