Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 10: Q7Q (page 286)

Figure 10-25ais an overhead view of a horizontal bar that can pivot; two horizontal forces act on the bar, but it is stationary. If the angle between the bar and F→2is now decreased from 90°and the bar is still not to turn, should F→2be made larger, made smaller, or left the same?

Short Answer

Expert verified

The force F2 will increase.

Step by step solution

01

Step 1: Given information

The diagram showing an overhead view of a horizontal bar

02

Understanding the concept

The effect of the decrease in angle on torque from the formula can be predicted. Then to keep it constant, find the force acting on it F2

Formulae are as follows:

τ=r×F=rFsinϕ

Where, r is radius, F is force and τ is torque.

03

Determining the change in force F2  to make the bar stationary:

τ=r×F=rFsinϕ

From the formula for torque, it can be concluded that if the angle is decreased, the corresponding torque will decrease. To keep it constant, so asthebar should not be turned, the forceF2must be increased.

Therefore, to keep an object non-rotating, the torque acting on it should be constant.

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

Figure 10-58shows a propeller blade that rotates at 2000 rev/minabout a perpendicular axis at point B. Point A is at the outer tip of the blade, at radial distance 1.50 m. (a) What is the difference in the magnitudes a of the centripetal acceleration of point A and of a point at radial distance 0.150 m? (b) Find the slope of a plot of a versus radial distance along the blade.

In the overhead view of Fig. 10 - 24, five forces of the same magnitude act on a strange merry-go-round; it is a square that can rotate about point P, at mid-length along one of the edges. Rank the forces according to the magnitude of the torque they create about point P, greatest first.

The angular position of a point on the rim of a rotating wheel is given by, θ=4.0t-3.0t2+t3where θ is in radians and t is in seconds. What are the angular velocities at

(a) t=2.0sand

(b) t=4.0s?

(c) What is the average angular acceleration for the time interval that begins at t=2.0sand ends at t=4.0s? What are the instantaneous angular accelerations at

(d) the beginning and

(e) the end of this time interval?

A thin spherical shell has a radius of 1.90 m.An applied torque of 960 N.m gives the shell an angular acceleration of 6.20 rad/s2 about an axis through the center of the shell. What are (a) the rotational inertia of the shell about that axis and (b) the mass of the shell?

Figure 10-34ashows a disk that can rotate about an axis at a radial distance hfrom the center of the disk. Figure 10-34b gives the rotational inertia lof the disk about the axis as a function of that distance h, from the center out to the edge of the disk. The scale on the laxis is set by lA=0.050kg.m2andlB=0.050kg.m2. What is the mass of the disk?
See all solutions

Recommended explanations on Physics Textbooks

Famous Physicists

Read Explanation

Force

Read Explanation

Engineering Physics

Read Explanation

Work Energy and Power

Read Explanation

Radiation

Read Explanation

Measurements

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