7th Edition

ISBN: 2818440037979

Author: GIANCOLI

Publisher: PEARSON

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Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics.

Equilibrium of Forces

The tension created on one body during push or pull is known as force.

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Textbook Question

Chapter 9, Problem 17P

Three children are trying to balance on a seesaw, which includes a fulcrum rock acting as a pivot at the center, and a very light board 3.2 m long (Fig. 9-57).Two playmates are already on either end. Boy A has a mass of 45 kg, and boy B a mass of 35 kg. Where should girl C, whose mass is 25 kg, place herself so as to balance the seesaw?

Chapter 9, Problem 17P, Three children are trying to balance on a seesaw, which includes a fulcrum rock acting as a pivot at

Figure 9-57

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Chapter 9, Problem 16P

Chapter 9, Problem 18P

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Race car driver is cruising down the street at a constant speed of 28.9 m/s (~65 mph; he has a “lead” foot) when the traffic light in front of him turns red. a) If the driver’s reaction time is 160 ms, how far does he and his car travel down the road from the instant he sees the light change to the instant he begins to slow down? b) If the driver’s combined reaction and movement time is 750 ms, how far do he and his car travel down the road from the instant he sees the light change to the instant he slams on her brakes and car begins to slow down? Please answer parts a-B. Show all work. For each question draw a diagram to show the vector/s. Show all the step and provide units in the answers. Provide answer to 2 decimal places. DONT FORGET TO DRAW VECTORS! ONLY USE BASIC FORMULAS TAUGHT IN PHYSICS. distance = speed * time.

Race car driver is cruising down the street at a constant speed of 28.9 m/s (~65 mph; he has a “lead” foot) when the traffic light in front of him turns red. a) If the driver’s reaction time is 160 ms, how far does he and his car travel down the road from the instant he sees the light change to the instant he begins to slow down? b) If the driver’s combined reaction and movement time is 750 ms, how far do he and his car travel down the road from the instant he sees the light change to the instant he slams on her brakes and car begins to slow down? c) If the driver’s average rate of acceleration is -9.5 m/s2 as he slows down, how long does it take him to come to a stop (use information about his speed of 28.9 m/s but do NOT use his reaction and movement time in this computation)? Please answer parts a-c. Show all work. For each question draw a diagram to show the vector/s. Show all the step and provide units in the answers. Provide answer to 2 decimal places unless stated otherwise.…

How is it that part a is connected to part b? I can't seem to solve either part and don't see the connection between the two.

Chapter 9 Solutions

PHYSICS:PRINCIPLES W/ APPLICATIONS

Ch. 9 - Prob. 1OQ Ch. 9 - Describe several situations in which an object is...Ch. 9 - Prob. 2Q Ch. 9 - You can find the center of gravity of a meter...Ch. 9 - Prob. 4Q Ch. 9 - A ground retaining wall is shown in Fig. 9-36a...Ch. 9 - Can the sum of the torques on an object be zero...Ch. 9 - A ladder, leaning against a wall, makes a 60°...Ch. 9 - A uniform meter stick supported at the 25-cm mark...Ch. 9 - Why do you tend to lean backward when carrying a...

Ch. 9 - Figure 9-38 shows a cone. Explain how to lay it on...Ch. 9 - Prob. 11Q Ch. 9 - Why is it not possible to sit upright in a chair...Ch. 9 - Why is it more difficult to do sit-ups when your...Ch. 9 - Explain why touching your toes while you are...Ch. 9 - Prob. 15Q Ch. 9 - Name the type of equilibrium for each position of...Ch. 9 - ( 17. ) Is the Young's modulus for a bungee cord...Ch. 9 - Prob. 18Q Ch. 9 - Prob. 19Q Ch. 9 - A 60-kg woman stands on the very end of a uniform...Ch. 9 - Prob. 2MCQ Ch. 9 - Prob. 3MCQ Ch. 9 - Prob. 4MCQ Ch. 9 - Two children are balanced on opposite sides of a...Ch. 9 - Prob. 6MCQ Ch. 9 - Prob. 7MCQ Ch. 9 - Prob. 8MCQ Ch. 9 - Prob. 9MCQ Ch. 9 - Prob. 10MCQ Ch. 9 - Three forces are applied to a tree sapling, as...Ch. 9 - Prob. 2P Ch. 9 - 3(I) A tower crane ( Fig. 9-48a) must always be...Ch. 9 - What is the mass of the diver in Fig. 9-49 if she...Ch. 9 - Prob. 5P Ch. 9 - Figure 9-50 shows a pair of forceps used to hold a...Ch. 9 - Prob. 7P Ch. 9 - The two trees in Fig. 9-51 are 6.6 m apart. A...Ch. 9 - Prob. 9P Ch. 9 - Prob. 10P Ch. 9 - Prob. 11P Ch. 9 - Find the tension in the two cords shown in Fig....Ch. 9 - Prob. 13P Ch. 9 - Prob. 14P Ch. 9 - The force required to pull the cork out of the top...Ch. 9 - Prob. 16P Ch. 9 - Three children are trying to balance on a seesaw,...Ch. 9 - A shop sign weighing 215 N hangs from the end of a...Ch. 9 - Prob. 19P Ch. 9 - Prob. 20P Ch. 9 - Prob. 21P Ch. 9 - 22 (II) A 20.0-m-long uniform beam weighing 650 N...Ch. 9 - Prob. 23P Ch. 9 - Prob. 24P Ch. 9 - Prob. 25P Ch. 9 - Prob. 26P Ch. 9 - A uniform rod AB of length 5.0 m and mass M=3.S kg...Ch. 9 - You are on a pirate ship and being forced to walk...Ch. 9 - Prob. 29P Ch. 9 - Prob. 30P Ch. 9 - Prob. 31P Ch. 9 - Prob. 32P Ch. 9 - Prob. 33P Ch. 9 - Prob. 34P Ch. 9 - Prob. 35P Ch. 9 - 36 (II) The Achilles tendon is attached to the...Ch. 9 - If 25 kg is the maximum mass m that a person can...Ch. 9 - Prob. 38P Ch. 9 - Prob. 39P Ch. 9 - Prob. 40P Ch. 9 - A marble column of cross-sectional area 1.4 m2...Ch. 9 - Prob. 42P Ch. 9 - A sign (mass 1700 kg) hangs from the bottom end of...Ch. 9 - Prob. 44P Ch. 9 - Prob. 45P Ch. 9 - Prob. 46P Ch. 9 - A steel wire 2.3 mm in diameter stretches by...Ch. 9 - Prob. 48P Ch. 9 - Prob. 49P Ch. 9 - Prob. 50P Ch. 9 - Prob. 51P Ch. 9 - Prob. 52P Ch. 9 - (a) What is the minimum cross-sectional area...Ch. 9 - Prob. 54P Ch. 9 - Prob. 55P Ch. 9 - Prob. 56P Ch. 9 - Prob. 57P Ch. 9 - Prob. 58GP Ch. 9 - Prob. 59GP Ch. 9 - Prob. 60GP Ch. 9 - Prob. 61GP Ch. 9 - Prob. 62GP Ch. 9 - Prob. 63GP Ch. 9 - Prob. 64GP Ch. 9 - When a mass of 25 kg is hung from the middle of a...Ch. 9 - Prob. 66GP Ch. 9 - Prob. 67GP Ch. 9 - Prob. 68GP Ch. 9 - Prob. 69GP Ch. 9 - Prob. 70GP Ch. 9 - Prob. 71GP Ch. 9 - Prob. 72GP Ch. 9 - Prob. 73GP Ch. 9 - A 2.0-m-high box with a 1.0-m-square base is moved...Ch. 9 - Prob. 75GP Ch. 9 - Prob. 76GP Ch. 9 - Prob. 77GP Ch. 9 - Prob. 78GP Ch. 9 - In a mountain-climbing technique called the...Ch. 9 - Prob. 80GP Ch. 9 - A cubic crate of side s=20m is top-heavy: its cgis...

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