60. Go The drawing shows a circus clown who weighs 890 N. The coefficient of static friction between the clown's feet and the ground is 0.53. He pulls verti- cally downward on a rope that passes around three pulleys and is tied around his feet. What is the mini- mum pulling force that the clown must exert to yank his feet out from under himself?

60. Go The drawing shows a circus clown who weighs 890 N. The coefficient of static friction between the clown's feet and the ground is 0.53. He pulls verti- cally downward on a rope that passes around three pulleys and is tied around his feet. What is the mini- mum pulling force that the clown must exert to yank his feet out from under himself?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Homework #9 (Force of Friction) 1. A 9.00-kg hanging object is connected by a light, inextensible cord over a light, frictionless pulley to a 5.00-kg block that is sliding on a flat table. Taking the coefficient of kinetic friction as 0.200, find the tension in the string. 5.00 kg m 9.00 kg M
12. QCA block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of 0 = 50.0° with the horizontal as shown in Figure P5.12. o The coefficient of static friction be- g tween the block and the wall is 0.250. (a) Determine the possible values for the magnitude of P that allow the block to remain stationary. (b) De- scribe what happens if P| has a larger value and what hap- pens if it is smaller. (c) Repeat parts (a) and (b), assuming the force makes an angle of 0 = 13.0° with the horizontal.
A 5.0-kg box is sitting on the floor and it will not move if the force is smaller than 35.0 N. - What is the coefficient of static friction between the box and the floor? - If the 35.0-N force continues, the box accelerates at 0.38 m/s^2. What is the coefficient of kinetic friction?
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4. It takes 59 N of horizontal force to just get a 22 kg suitcase just starting to move across a floor. Determine the coefficient of friction. please hand write it clearly.
11. A 6.0 kg block sits at rest on a 25° inclined plane. If this is the steepest the ramp can be before the block slides, determine the coefficient of static friction between the block and plane. 0.89 0.29 0.68 0.47
5. A 7.6 kg object is at rest on an inclined plane. If the inclined plane makes an angle with the horizontal of 33°, what is the coefficient of static friction between the object and the plane? Assume the box is just about to slide and this is the maximum static friction.
Multiple part question: A worker in a factory slides a heavy box up a ramp into a truck. The box has a mass of 84 kg, and the ramp is 3 m long and makes an angle of 34° with the horizontal. The coefficient of friction between the box and ramp is 0.6. What is the weight of the box? What is the normal force acting on the box? What is the force of friction acting on the box? Assuming the worker pushes the box up the ramp with a constant velocity, how much work does the factory worker do on the box in order to get it into the truck? How much gravitational potential energy does the box have once it reaches the top of the ramp?
5. A 3.00 kg mass is initially at rest at the bottom of an incline of 35.0°. An applied force begins acting on the mass, pushing it up the incline with a constant force of 25.0 N, directed parallel to the incline. a) If the acceleration produced is 2.50 m/s? up the incline, what must the coefficient of kinetic friction be? b) If the applied force acts for 2.00 s, how far up the incline will the mass travel upon coming to rest? Measure this from where the applied force starts acting to where the mass comes to a stop.
Question 6 13. A7.5 kg backpack is sliding across the floor. The coefficient of friction between the backpack and the floor is 0.20. Answer the following: c) What is the force of friction on the backpack? Your answer: O 1.5 N O 7.4 N O 15 N O 74 N
37. A suitcase with mass 18 kg is pulled at a constant speed by a handle that makes an angle θ with the horizontal. The frictional force on the suitcase is 27 N and the force applied on the handle is 43 N. (a) Determine the value of the angle, θ. (b) Determine the normal force exerted on the suitcase.
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