Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 12: Q. 22 (page 331)

A 4.0-m-long, 500 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about the bolt due to the worker and the weight of the beam?

Short Answer

Expert verified

sd

Step by step solution

01

sd

sd

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

An object whose moment of τ(Nm)inertia is 4.0kgm2experiences the torque shown in FIGURE EX12.25. What is the object's angular velocity at t=3.0s? Assume it starts from rest.

The bunchberry flower has the fastest-moving parts ever observed in a plant. Initially, the stamens are held by the petals in a bent position, storing elastic energy like a coiled spring. When the petals release, the tips of the stamen act like medieval catapults, flipping through a 60o­ angle in just 0.30 ms to launch pollen from anther sacs at their ends. The human eye just sees a burst of pollen; only high-speed photography reveals the details. As FIGURE CP12.85 shows, we can model the stamen tip as a 1.0mm long, 10 μg rigid rod with a 10 μg anther sac at the end. Although oversimplifying, we’ll assume a constant angular
acceleration.

a. How large is the “straightening torque”?
b. What is the speed of the anther sac as it releases its pollen?

Force F→=−10ȷ^Nis exerted on a particle at r→=(5ı^+5ȷ^)m. What is the torque on the particle about the origin?

The three masses shown in FIGURE EX12.6 are connected by massless, rigid rods. What are the coordinates of the center of mass?

Starting from rest, a 12-cm-diameter compact disk takes 3.0 s to reach its operating angular velocity of 2000 rpm . Assume that the angular acceleration is constant. The disk's moment of inertia is 2.5×10−5kgm2.

a. How much net torque is applied to the disk?

b. How many revolutions does it make before reaching full speed?
See all solutions

Recommended explanations on Physics Textbooks

Work Energy and Power

Read Explanation

Scientific Method Physics

Read Explanation

Fields in Physics

Read Explanation

Physical Quantities And Units

Read Explanation

Space Physics

Read Explanation

Wave Optics

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