College Physics, Volume 1
2nd Edition
ISBN: 9781133710271
Author: Giordano
Publisher: Cengage
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Chapter 3, Problem 39P
To determine
Normal force between the crates.
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A robot pushes a 20-kg giftbox on the horizontal surface as part of the moving job for the holiday season, the force is 79 N to the right as shown. The box does not move. The coefficients of friction between the floor and box are μs = 0.75 and μk = 0.40. What is the magnitude (absolute value) of the friction force on the box, in Newtons? Use g = 10 m/s2.
Two blocks are connected by a string as shown. The inclination of the ramp is θ = 39° while the masses of the blocks are m1 = 7.8 kg and m2 = 19.6 kg. Friction is negligible.
Write an equation for the magnitude of the acceleration the two blocks experience. Give your equation in terms of m1, m2, θ, and the acceleration due to gravity g. Consider down the ramp to be the negative direction in this calculation.
What is the magnitude of the acceleration of each block in ms2ms2?
Write an equation for the tension in the string in terms of m2, the acceleration due to gravity g, and the acceleration of the two blocks a.
What is the tension in the rope in newtons?
An athlete pulls box E using an inextensible rope P while being resisted by another inextensible rope S.
Let P be the tension force on rope P and S be the tension force on rope S. Consider particle analysis involving
only forces P and S.
P
E
S
2. If P = 495N, S = 465N, 0 = 10° and a = 29° , which of the following is closest to the magnitude and direction of
R?
322 N, 32.9degs
161.2 N, 81.8degs
322 N, 32.9deg
161.2N, 81.1dega
Chapter 3 Solutions
College Physics, Volume 1
Ch. 3.2 - Prob. 3.1CCCh. 3.3 - Prob. 3.2CCCh. 3.4 - Prob. 3.3CCCh. 3.4 - Prob. 3.4CCCh. 3.5 - Prob. 3.5CCCh. 3.6 - Prob. 3.6CCCh. 3.7 - Acceleration of a Skydiver Figure 3.27 shows a...Ch. 3 - Prob. 1QCh. 3 - Prob. 2QCh. 3 - Prob. 3Q
Ch. 3 - Prob. 4QCh. 3 - Prob. 5QCh. 3 - Prob. 6QCh. 3 - Prob. 7QCh. 3 - Prob. 8QCh. 3 - The lower piece of silk in Figure 3.20 is acted on...Ch. 3 - Devise a block-and-tackle arrangement that...Ch. 3 - Prob. 11QCh. 3 - Prob. 12QCh. 3 - Prob. 13QCh. 3 - Prob. 14QCh. 3 - Prob. 15QCh. 3 - Prob. 16QCh. 3 - Prob. 17QCh. 3 - Prob. 18QCh. 3 - Prob. 19QCh. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Prob. 9PCh. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Prob. 12PCh. 3 - Prob. 13PCh. 3 - Prob. 14PCh. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - Prob. 17PCh. 3 - Prob. 18PCh. 3 - Prob. 19PCh. 3 - Prob. 20PCh. 3 - Prob. 21PCh. 3 - Prob. 22PCh. 3 - A bullet is fired upward with a speed v0 from the...Ch. 3 - Prob. 24PCh. 3 - Prob. 25PCh. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Prob. 29PCh. 3 - Prob. 30PCh. 3 - Prob. 31PCh. 3 - Prob. 32PCh. 3 - Your friends car has broken down, and you...Ch. 3 - Prob. 34PCh. 3 - Prob. 35PCh. 3 - Prob. 36PCh. 3 - Prob. 37PCh. 3 - Prob. 38PCh. 3 - Prob. 39PCh. 3 - You are given the job of moving a refrigerator of...Ch. 3 - Prob. 41PCh. 3 - Prob. 42PCh. 3 - Prob. 43PCh. 3 - Prob. 44PCh. 3 - Prob. 45PCh. 3 - Prob. 46PCh. 3 - A hockey puck slides along a rough, icy surface....Ch. 3 - Prob. 48PCh. 3 - Prob. 49PCh. 3 - Prob. 50PCh. 3 - Prob. 51PCh. 3 - Prob. 52PCh. 3 - Prob. 53PCh. 3 - Prob. 54PCh. 3 - Prob. 55PCh. 3 - Prob. 56PCh. 3 - Prob. 57PCh. 3 - Prob. 58PCh. 3 - Prob. 59PCh. 3 - Prob. 60PCh. 3 - A crate of mass 55 kg is attached to one end of a...Ch. 3 - Prob. 62PCh. 3 - Prob. 63PCh. 3 - In traction. When a large bone such as the femur...Ch. 3 - Prob. 65PCh. 3 - Prob. 66PCh. 3 - Prob. 67PCh. 3 - Prob. 68PCh. 3 - Calculate the terminal speed for a pollen grain...Ch. 3 - Prob. 70PCh. 3 - Prob. 71PCh. 3 - Calculate the terminal speed for a baseball. A...Ch. 3 - Prob. 73PCh. 3 - Prob. 74PCh. 3 - Prob. 75PCh. 3 - Prob. 76PCh. 3 - Prob. 77PCh. 3 - Prob. 78PCh. 3 - Prob. 79PCh. 3 - Prob. 80PCh. 3 - Prob. 81PCh. 3 - Prob. 82PCh. 3 - Prob. 83PCh. 3 - Prob. 84PCh. 3 - Prob. 85PCh. 3 - An impish young lad Stands on a bridge 10 m above...Ch. 3 - Prob. 87PCh. 3 - Prob. 88PCh. 3 - Prob. 89PCh. 3 - Prob. 90PCh. 3 - Prob. 91PCh. 3 - Prob. 92PCh. 3 - Prob. 93PCh. 3 - Prob. 94PCh. 3 - Prob. 95PCh. 3 - Prob. 96PCh. 3 - Prob. 97PCh. 3 - Prob. 98PCh. 3 - Prob. 99P
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- A man pushes a 49 kg block of ice in the positive direction across a frozen lake as shown in the picture. The coefficients of static and kinetic friction are μs=0.1 and μk=0.03. calculate the minimum force F he must exert to get the block sliding across the ice in newtons. what is the acceleration in m/s^2 once it starts to move if the minimum force is maintained?arrow_forwardthree blocks attached by cords that loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 6.00 kg, mB = 8.00 kg, and mC = 10.0 kg. When the blocks are released, what is the tension in the cord at the right?arrow_forwardA hockey puck slides with an initial speed of 56.7 m/s on a large frozen lake. The coefficient of kinetic friction between the puck and the ice is 0.05. What is the acceleration on the hockey puck caused by friction? Assume the puck's velocity is in the positive-x direction. And what is the speed of the puck after 6 s?arrow_forward
- A person weighing 935. N rides in an elevator that has a downward acceleration of 1.26 m/s2. What is the magnitude of the force (in N) of the elevator floor on the person?arrow_forwardConsider two blocks connected . Block A has mass 2.00 kg, and block B has mass 5.00 kg. The table on which B sits is frictionless, the cord connecting the blocks is light and flexible, and the pulley is light and frictionless. The horizontal force F S has magnitude F = 20.0 N, and block B moves to the left with an acceleration of 1.50 m/s2. What is the tension in the cord that connects the two blocks?arrow_forwardA horizontal force of magnitude F = 56.2 N pushes on a block of mass m = 5.87 kg. The block is on a frictionless incline that makes and angle θ = 33.9 degrees with horizontal.Write an expression for the acceleration ax of the block, taking up the ramp to be the positive x direction. Express your answer in terms of F, m, θ, and g (9.80 m/s2). What is the acceleration of the block in units of meters per seconds squared?arrow_forward
- A 129 kg crate is sitting at the top of a ramp, which is inclined at an angle of 20 degrees with respect to the horizontal. Someone gives the crate a quick shove to get it moving, after which it slides down the ramp without any further assistance. The coefficient of kinetic friction between the crate and the ramp is ls = 0.23. What is the magnitude of the acceleration (in m/s?) of the crate?arrow_forwardTwo crates connected by a rope lie on a horizontal surface (Figure 1). Crate A has mass mA and crate B has mass mB. The coefficient of kinetic friction between each crate and the surface is μk. The crates are pulled to the right at constant velocity by a horizontal force F. In terms of mA, mB, and μk, calculate the magnitude of the force F. Express your answer in terms of some or all of the variables mA, mB, μk, and acceleration due to gravity g. In terms of mA, mB, and μk, calculate the tension in the rope connecting the blocks. Include the free-body diagram or diagrams you used to determine each answer.arrow_forwardThe figure shows three blocks attached by cords that loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA=5.00 kg, mB=7.00 kg, and mC=9.00 kg. When the blocks are released, what is the tension in the cord at the right?arrow_forward
- A student is pulling a crate with a mass of 83.0 kg along a horizontal frictionless floor with a rope that’s inclined at an angle θ = 30.0° above the horizontal as shown. The tension force is measured to be 232 N. What is the magnitude of the normal force on the crate from the floor, in Newtons? Use g = 10.0 m/s2.arrow_forwardThree forces are exerted on an object placed on a tilted floor. The three forces are directed as shown in Figure E2.1 . If the forces have magnitudes F1 = 1.0 N, F2 = 8.0 N and F3 = 7.0 N, what is the component of the net force Fnet = F 1 + F2 + F3 parallel to the floor?arrow_forwardTwo blocks are connected by a massless rope over a massless, frictionless pulley, as shown in the figure. The mass of block 2 is ?2=10.5 kgm2=10.5 kg , and the coefficient of kinetic friction between block 2 and the incline is ??=0.200μk=0.200 . The angle ?θ of the incline is 25.5°25.5° . If block 2 is moving up the incline at constant speed, what is the mass?1m1 of block 1?arrow_forward
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