COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 90QAP
To determine
The minimum coefficient of static friction between the tires and the pavement.
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A load of 52 kg is placed on the flatbed of a truck going around a section of flat road corresponding to a circular arc with a radius of 80 m. If the coefficient of static friction between the load and the truck's flatbed is 0.355, what is the maximum speed the truck can have so the load won't slide?
a) 28.0 m/s
b) 5.33 m/s
c) 16.7 m/s
d) 22.6 m/s
e) 279 m/s
The uniform crate has a mass of 150 kg. If the coefficient of static friction between the crate and the floor is us = 0.2, determine the smallest mass of the man so he can move the crate. The coefficient of static friction between his shoes and the floor is us = 0.45.
Assume the man exerts only a horizontal force on the crate
2.4 m
1.6 m
-1.2 m-
Q1) Circular motionA carnival ride has people stand inside a vertical cylinder with theirbacks to the wall. The cylinder starts spinning counterclockwise and theriders find that they are “stuck” to the wall and don’t slide down, evenwhen the floor is removed.The ride has a radius of r. The person has a mass of m and is movingwith a constant speed of v. The coefficient of static friction between theperson and the wall is μs , and kinetic friction μk. The person is onlytouching the wall, not touching the floor.a) Draw a free body diagram for the person when they are on the left-hand side, as shown.Clearly label all forces. Use the notation used in class.b) What is the magnitude and direction of the acceleration of the person?Give your answer in terms of variables only (r, v, m, μs, μk, and g)c) What is the magnitude of the normal force of the wall on the person?Solve this problem using Newton’s 2nd Law. Show all your work.Give your answer in terms of variables only (r, v, m, μs, μk, and…
Chapter 5 Solutions
COLLEGE PHYSICS
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- 8-63. Determine the smallest force P that will cause impending motion. The crate and wheel have a mass of 50 kg and 25 kg, respectively. The coefficient of static friction between the crate and the ground is , = 0.2, and between the wheel and the ground, = 0.5. *8-64. Determine the smallest force P that will cause impending motion. The crate and wheel have a mass of 50 kg and 25 kg. respectively. The coefficient of static friction between the crate and the ground is , = 0.5, and between the wheel and the ground μ = 0.3. O O O 127 10 L C A 300 mmarrow_forward4) A 30-kilogram child is sitting 2.0 meters from the centre of a merry-go-round. The coefficients of static and kinetic friction between the child and the surface of the merry-go-round are 0.8 and 0.6, respectively. Determine the maximum speed of the merry-go-round before the child begins to slip.arrow_forwardCircular turns of radius r in a race track are often banked at an angle θ to allow the cars to archive higher speed around the turns. Assume friction is not present. A) Find the y- component of the normal force FN on a car going around the turn in terms of the angle θ and the magnitude of the normal vector FN B) Find the x- component of the normal force FN on a car going around the turn in terms of angle θ the magnitude of the normal vector FN C) Write an expression for tan( θ ) of a car going around the banked turn in terms of the car's speed v, radius of the turn r and g so that the car's will no move up or down the incline of the turnarrow_forward
- 30 - A bead slides without friction on the folded wire as a circle from its end, as shown in the figure. The bead is dropped from a height of h = 4.00 R. This bead has a mass of 5.00 g. Find the magnitude and direction of the force acting on this bead at point Ⓐ. a) 0.248 N: downstream B) 0.098 N: downstream NS) 0.147 N: downstream D) 0.098 N: upwards TO) 0.345 N: upwardsarrow_forward**.59 SSM ILW In Fig. 6-45, a 1.34 kg ball is connected by means of two massless strings, each of length L = 1.70 m, to a vertical, rotating rod. The strings are tied to the rod with separation d = 1.70 m and are taut. The tension in the upper string is 35 N. What are the (a) tension in the Rotating rod lower string. (b) magnitude of the net force Feet on the ball, and (c) speed of the ball? (d) What is the di- rection of Faet? Flg. 6-45 Problem 59.arrow_forward4) Is it safe to drive your 1600-kg car at a speed of 27 m/s around a level highway curve of radius 150 m if the effective coefficient of static friction between the car and the road is 0.40? Explain.arrow_forward
- 3.- A truck tows a 400 kg log from a ditch by means of a winch attached to its rear part. Knowing that the winch applies a constant force F and the coefficient of kinetic friction between the ground and the log is 0.5, determine the force F if the log reaches a speed of 0.5 m / s in 1.8 s. Visual representation (Make drawings or diagrams, clearly indicate the vectors and variables involved in the problem, it can be on the drawing)arrow_forward1) Circular motion, vertical surface, with static friction: At an amusement park, you are on a ride which spins in a horizontal circle of radius R. Your back is to a vertical wall on the inside of the circle. The coefficient of static friction between you and the wall is ,. At a certain speed, the floor drops away, but you don't slide downward against the wall-you stay at "rest" relative to the wall. (Search "Rotor carnival ride" on YouTube to see an example.) a) Draw a FBD of you. b) Determine the minimum radial acceleration such that you don't slide when the floor is gone. dopust c) Determine the minimum tangential speed such that you don't slide when the floor is gone. d) Determine the period of time for you to go around once. e) Determine all these values if R = 10.0 m, , = 0.25. R +You No floor Taxisarrow_forwardIf the curve on Road has a bank angle of 18 degrees and the radius of curvature is 225m a) What is the Max speed you can go if the coefficient of friction between the tires and the road is 0.3 . Your car is 1500 kg b) what is the minimum speed you can go without sliding?arrow_forward
- Driving in your car with a constant speed of v = 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure (Figure 1). Part A For the steps and strategies involved in solving a similar problem, you may view the following Quick Example 6-17 video: If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car as you pass over the top of the bump. SOLUTION Express your answer in newtons. We use Newton's secend lew 2R, = may ? Wa = Submit Request Answer Provide Feedback Figurearrow_forwardCNM PHYSICS, ASTRONOMY & ENGINEERING 8-12 EF on an Incline and in a Circle B' B C D OD' Figure 8. Q19 If the acceleration of the body is toward the center, what is the direction of the unbalanced force? Q20 Using the equation for Newton's 2nd Law for uniform circular motion and the parameters currently set in your interactive, calculate the magnitude of the force acting on the object to keep it in circular motion. Show all of your work below. Does your value match the interactive's value for the net force acting on the object?arrow_forwardA string is attached to a 120-gram wooden cube. The string turns in a horizontal circle of radius 5.0 cm but make angle of 25° below the horizontal. a) Calculate the tension in the string B) Calculate the speed of the wooden block.arrow_forward
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Newton's Second Law of Motion: F = ma; Author: Professor Dave explains;https://www.youtube.com/watch?v=xzA6IBWUEDE;License: Standard YouTube License, CC-BY