COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 59QAP
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Draw a free body diagram for a cycle rolling down a hill.
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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)
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 4 Solutions
COLLEGE PHYSICS
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- Describe a situation in which the net external force on a system is not zero, yet its speed remains constant.arrow_forward8-63. 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_forwardThe block at point A is released from rest on a smooth track, which is one quadrant of a circle of radius 5m. It continues to move along a rough surface from point B to E and acquires a velocity of 8.6 m/s at point C. If its velocity at E is 2.25 m/s, calculate: a) velocity at B b) the coefficient of friction between the block and the surface B to E c) mass of the block, if the loss in KE between points D to C is 24.05 J d) velocity at D e) distance DEarrow_forward
- Circular 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_forward5) *14-28. The 10-lb box falls off the conveyor belt at 5-ft/s. If the coefficient of kinetic friction along AB is µ = 0.2, determine the distance x when the box falls into the cart. 5 ft/s 15 ft B 30 ft 5 ft wnwardarrow_forward26, 20- 150 m Problem (4) A motorcycle is traveling 80 mph (miles per hour) at point A. Knowing that the motorcycle's speed decreases at a rate of a, = -(0.04 s) m/s² while traveling up a 150-meter radius hill from point A (sA = 0) to point B, determine the traction force of the motorcycle and the normal reaction the ground imparts on the motorcycle at point B. The combined mass of the motorcycle and driver is 340 kilograms. (Hint: 1,609 meters 1 mile) 150 m Assume friction is negligible.arrow_forward
- Problem 23-24. The box shown in Figurelies on a plane tilted at an angle 25 degrees to the horizontal,with coefficient of kinetic friction of 0.19(23) Determine the acceleration of the crate as it slides downthe plane.a. 8.10m/ c. 2.46m/b. 5.84/ d. 6.0m/(24) If the crate starts from rest 8.15 m up along the planefrom its base, what will be the crate’s speed when it reachesthe bottom of the incline?a. 11.49m/s c. 6.33m/sb. 9.76m/s d. 9.89m/sarrow_forward2) Determine the velocity of body A and body B after 3 seconds if the system is released from rest. Neglect friction and the inertia of the pulleys. 500 kg A 20⁰ B 200 kgarrow_forwardPROBLEM 2 • An elevator and its load have a total mass of 800kg.Find the tension in the supporting cable when the elevator or lift originally moving downwards at 10m/s is brought to rest with a constant acceleration in a distance 25m Answer T-9600N.Since T> W the system is retarding.arrow_forward
- You have been called as an expert witness for a trial in which a driver has been charged with speeding but is claiming innocence. He claims to have slammed on his brakes to avoid rear-ending another car, but tapped the back of the other car just as he came to rest. You have been hired by the prosecution to prove that the driver was indeed speeding. You have received data as follows from the police: Skid marks left by the driver are 56.0 m long and the roadway is level. Tires matching those on the car of the driver have been dragged over the same roadway to determine that the coefficient of kinetic friction between the tires and the roadway is 0.82 at all points along the skid mark. The speed limit on the road is 35 mi/h. Construct an argument to be used in court to show that the driver was indeed speeding.arrow_forwardProfessional Application During a visit to the International Space Station, an astronaut was positioned motionless in the center of the station, out of reach of any solid object on which he could exert a force. Suggest a method by which he could move himself away from this position, and explain the physics involved.arrow_forwardA block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.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