College Physics: A Strategic Approach (4th Edition)
4th Edition
ISBN: 9780134609034
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 8, Problem 2P
To determine
To find: The reading on each of the scales.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
A 50 kgkg woman stands on a very light, rigid board that rests on a bathroom scale at each end, as shown in figure.(Figure 1)
a. What is the reading on each of the scales?
On the left scale Express your answer using two significant figures.
b. On the right scale. Express your answer using two significant figures.
Ray decides to paint the outside of his uncle's house. He uses a 4.0-mm-long board supported by vertical cables at each end to paint the second floor. The board has a mass of 21 kgkg. Ray (70 kgkg) stands 1.0 mm from the left cable.
Determine the magnitude of the force that the right cable exerts on the board.
Determine the magnitude of the force that the left cable exerts on the board
Consider the woman doing push-ups in the figure. She has a mass of 49.2 kg, and the distance from her feet to her center of mass is 0.96 m, while the distance from her feet to her hands is 1.75m.
a. What force in newtons should the woman in the figure exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.
b. The triceps muscle at the back of her upper arm has an effective lever arm of 1.95 cm, and she exerts force on the floor at a horizontal distance of 15.5 cm from the elbow joint. Calculate the magnitude of the force in newtons for each triceps muscle.
c. How much work in joules does she do if her center of mass rises 0.27 m?
d. What is her useful power output, in watts, if she does 25 pushups in one minute? For the sake of simplicity, ignore any power used by her muscles lowering her body during each pushup.
Chapter 8 Solutions
College Physics: A Strategic Approach (4th Edition)
Ch. 8 - Prob. 1CQCh. 8 - Could a ladder on a level floor lean against a...Ch. 8 - Prob. 3CQCh. 8 - Prob. 4CQCh. 8 - Prob. 5CQCh. 8 - Prob. 6CQCh. 8 - Prob. 7CQCh. 8 - A spring exerts a 10 N force after being stretched...Ch. 8 - Prob. 9CQCh. 8 - A typical mattress has a network of springs that...
Ch. 8 - Take a spring and cut it in half to make two...Ch. 8 - A wire is stretched right to its breaking point by...Ch. 8 - Prob. 13CQCh. 8 - Prob. 14CQCh. 8 - Steel nails are rigid and unbending. Steel wool is...Ch. 8 - Two children hold opposite ends of a lightweight,...Ch. 8 - Prob. 19MCQCh. 8 - Prob. 20MCQCh. 8 - Prob. 21MCQCh. 8 - Prob. 22MCQCh. 8 - Prob. 23MCQCh. 8 - Prob. 24MCQCh. 8 - Prob. 25MCQCh. 8 - Prob. 26MCQCh. 8 - You have a heavy piece of equipment hanging from a...Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Youre carrying a 3.6-m-long, 25 kg pole to a...Ch. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 9PCh. 8 - Prob. 11PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - The stability of a vehicle is often rated by the...Ch. 8 - Prob. 18PCh. 8 - A car manufacturer claims that you can drive its...Ch. 8 - Prob. 20PCh. 8 - An orthodontic spring, connected between the upper...Ch. 8 - Prob. 22PCh. 8 - Experiments using optical tweezers measure the...Ch. 8 - Prob. 24PCh. 8 - One end of a 10-cm-long spring is attached to the...Ch. 8 - Prob. 26PCh. 8 - A spring has an unstretched length of 10 cm. It...Ch. 8 - A spring stretches 5.0 cm when a 0.20 kg block is...Ch. 8 - You need to make a spring scale to measure the...Ch. 8 - Prob. 30PCh. 8 - A force stretches a wire by 1.0 mm. a. A second...Ch. 8 - Prob. 32PCh. 8 - What hanging mass will stretch a 2.0-m-long,...Ch. 8 - An 80-cm-long, 1.0-mm-diameter steel guitar string...Ch. 8 - A mineshaft has an ore elevator hung from a single...Ch. 8 - The normal force of the ground on the foot can...Ch. 8 - A three-legged wooden bar stool made out of solid...Ch. 8 - Prob. 38PCh. 8 - Prob. 39PCh. 8 - Prob. 40PCh. 8 - A glass optical fiber in a communications system...Ch. 8 - The Achilles tendon connects the muscles in your...Ch. 8 - Prob. 44PCh. 8 - Prob. 47PCh. 8 - Prob. 48PCh. 8 - Prob. 49PCh. 8 - Prob. 51GPCh. 8 - Prob. 52GPCh. 8 - Prob. 53GPCh. 8 - Prob. 55GPCh. 8 - Two identical, side-by-side springs with spring...Ch. 8 - Prob. 57GPCh. 8 - Prob. 58GPCh. 8 - Prob. 59GPCh. 8 - A 25 kg child bounces on a pogo stick. The pogo...Ch. 8 - Prob. 61GPCh. 8 - In the hammer throw, an athlete spins a heavy mass...Ch. 8 - There is a disk of cartilage between each pair of...Ch. 8 - Orb spiders make silk with a typical diameter of...Ch. 8 - Larger animals have sturdier bones than smaller...Ch. 8 - Prob. 67GPCh. 8 - Prob. 68GPCh. 8 - Prob. 69MSPPCh. 8 - Prob. 70MSPPCh. 8 - Prob. 71MSPPCh. 8 - Prob. 72MSPP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A 20 kg dog stands on a 40 kg platform that is supported by two ropes. One rope is attached to the right edge of the platform and the other is attached 50 cm from the left edge of the platform. The dog sits 50 cm from the right edge of the platform. A 5.0 kg cat jumps up, but is wary of the dog abs stays all the way on the left edge. The platform is 2.0 m long. What is the tension in each rope?arrow_forwardThe figure below shows a bird feeder that weighs 100.1 N. The feeder is supported by a vertical wire, which is in turn tied to two wires, each of which is attached to a horizontal support. The left wire makes a 60° angle with the support, while the right wire makes a 30° angle. What is the tension in each wire (in N)arrow_forwardThe figure below shows a bird feeder that weighs 187.1 N. The feeder is supported by a vertical wire, which is in turn tied to two wires, each of which is attached to a horizontal support. The left wire makes a 60° angle with the support, while the right wire makes a 30° angle. What is the tension in each wire (in N)? A bird feeder is suspended from a vertical wire. The top of the wire is tied to two other wires. The left and right wires go up and to the left and up and to the right, respectively, from the connection point to a horizontal support. The left wire makes an angle of 60° with the support. The right wire makes an angle of 30° with the support. left wire Nright wire Nbottom wire Narrow_forward
- Answer the following questions. 1. A box of weight 100 N hangs from the rope. The rope weighs 50 N and is uniform. What is the tension in the rope? a. 100 N throughout the rope b. 150 N throughout the rope It varies from 100 N at the bottom of the rope to 150 N at the с. top. A block of weight 25 kg is resting on an inclined surface with dimensions of 4 meter wide and 3 m high (See figure at the fight). Find the following: 2. Which of the following about the figure NOT true? Given wotating the axes 37 degrees clockwise. a. Fx=Ff-245sin37 b. Fx=Ff-25sin37 5m c. Fx=Ff-245cos 37 d. Fx=Ff-245sin37 3 m 3. Which of the following about the figure NOT true? Given 37 otating the axes 37 degrees clockwise. a. Fy=N-245cos37 b. Fy=N-245sin37 c. Fy=N-25cos37 d. Fy=N-25sin37 4. Find the Normal force Nacting on the object. a. 19.96 N b. - 19.86 N c. 195.66 N d. 147.44 N 4 m 5. Find the friction force Ff a. 19.96 N b. - 19.86 N c. 195.66 N d. 147.44 N 6. Find the coefficient of static friction µ. a.…arrow_forwardTwo uniform 66.1-gg marbles 2.16 cmcm in diameter are stacked as shown in the figure (Figure 1) in a container that is 3.00 cmcm wide. Find the force that the container exerts on the marble at the point of contact A. What force does each marble exert on the other?arrow_forward2. The figure shows a mobile of toys hanging from a ceiling. The black vertical lines represent wires from which crossbars are hung. The red crossbar has its left and right arms in equal length while the blue crossbars have right arms that are twice the length of their left arms. The crossbars are all horizontal and they themselves as well as the wires have negligible mass. Toy 1 has mass m = 1 kg. What are the masses m2, m3, m4, and m5 of toys 2, 3, 4, and 5, respectively? toy 1 toy 2 toy3 toy4 toy5arrow_forward
- A cook holds a 1.80-kg carton of milk at arm's length. What force FB must be exerted by the biceps muscle? An arm is extending horizontally to the left with a cutout that shows muscles in the upper arm. A carton of milk is in the hand, and an arrow labeled vector Fg points directly downward. A point on the person's forearm lies a horizontal distance of 25.0 cm to the right of the milk and a horizontal distance of 8.00 cm to the left of the elbow. An arrow labeled vector FB points from this point up and to the right at an angle of 75.0° from the vertical.arrow_forwardBart, mass 35.7 kilograms, and Milhouse, mass 27.6 kilograms, play on the schoolyard seesaw. If Bart and Milhouse want to sit 3.3 meters apart, how far from the center of the seesaw should Bart sit? Include units in your answer.arrow_forwardA mobile is constructed of light rods, light strings, and beach souvenirs as shown in the figure below. If m (a) m₁ = 9.67 (b) m₂ m₂ d3 = 130.02 = =111.24 72 d₁ d4 d5 ms g g d2 (c) m3 (d) What If? If m₁ accidentally falls off and shatters when it strikes the floor, the rod holding m4 will move to a vertical orientation so that m4 hangs directly below the end of the rod supporting m₂. To what values should m₂ and m3 the other two rods will remain in equilibrium and be oriented horizontally? (Enter your answers in g.) be adjusted so that m₂ = g m3 468.67 X g g d6 = "4 12.0 g, find values (in g) for the following. (Let d₁ = 3.30 cm, d₂ = 4.50 cm, d3 = 1.00 cm, d4 = 6.00 cm, d5 = 2.90 cm, and d = 3.60 cm.) mzarrow_forward
- A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.05 g coins stacked over the 31.5 cm mark, the stick is found to balance at the 45.3 cm mark. What is the mass of the meter stick? Number i Save for Later Unitsarrow_forwardA 5 N picture frame is supported by two strings that run from its upper corners to a nail on the wall. What is the tension on each string if each string makes an angle of 30° with the horizontal?arrow_forwardTwo construction workers carry a 2.8 m long wooden beam on their shoulders. It is horizontal while they carry it. One worker is at the end of the beam and the other is standing 2.6 m away from the first worker. The beam has a mass of 190 kg. a. Do the workers exert the same amount of force on the beam? You can just use intuition on this one. No math is required.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
University Physics (14th Edition)
Physics
ISBN:9780133969290
Author:Hugh D. Young, Roger A. Freedman
Publisher:PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:9781107189638
Author:Griffiths, David J., Schroeter, Darrell F.
Publisher:Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:9780321820464
Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...
Physics
ISBN:9780134609034
Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:PEARSON