A 500-N box is at rest on the floor. Dennis Elbo makes several attempts to move the box, pushing against the box with varying amounts of horizontal force. Yet the box never does move. In this situation, the amount of static friction force experienced by the box Select all that apply. --- .

A 500-N box is at rest on the floor. Dennis Elbo makes several attempts to move the box, pushing against the box with varying amounts of horizontal force. Yet the box never does move. In this situation, the amount of static friction force experienced by the box Select all that apply. --- .

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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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 box with mass m=1.25 kg rests on the top of a bar. The coefficient of static friction between the box and the bar is μs=0.73 and the coefficient of kinetic friction is μk=0.39. a) Write an expression for Fm the minimum force required to produce movement of the box on the top of the bar. b) Solve numerically for the magnitude of the force Fm in Newtons. c) Write an expression for a, the box's acceleration, after it begins moving. (Assume the minimum force, Fm, continues to be applied.) d) Solve numerically for the acceleration, a in m/s².
Question 2 The Q-kg industrial door with mass center at G is being positioned for repair by insertion of the 5° wedge under corner B. Horizontal movement is prevented by the small ledge at corner A. The coefficients of static friction at both the top and bottom wedge surfaces are 0.66. Calculate the rightward force P' which would remove the wedge from under the door. Assume that corner A does not slip for your calculation of P'. Q- 780 Q= P¹ = Blank 1 N Blank 1 Add your answer 1.2 m- -0.8 m ...
Suppose there is a box of books with a mass of 10 kg resting on a flat horizontal table, and that the coefficient of static friction between the table and the box is 0.5. At a minimum, how much force do you have to apply to lift the box off the table vertically? At a minimum, how much force do you have to apply to shift the box horizontally across the table? Explain your answers.
GOAL Apply the concept of static friction to an object resting on an incline. PROBLEM Suppose a block with a mass of 2.50 kg is resting on a ramp. If the coefficient of static friction between the block and ramp is ng sin e 0.350, what maximum angle can the ramp make with the horizontal mg cos e e before the block starts to slip down? STRATEGY This is an application of Newton's second law involving an object in equilibrium. Choose tilted coordinates, as in the figure. Use the fact that the block is just about to slip when the force of static friction takes its maximum value, f. = 4n. SOLUTION Write Newton's laws for a static system (1) EF = mg sin e - u̟n = 0 in component form. The gravity force (2) EF = n - mg cos e = 0 has two components. Rearrange Equation (2) to get an n = mg cos 8 expression for the normal force n. Substitute the expression for n into EF, = mg sin 8 - H mgcos 0 = 0 → tan 8 =u. Equation (1) and solve for tan 0. Apply the inverse tangent function to get the answer.…
Problem 1: While training on the planet Dagobah, Luke Skywalker is asked by Yoda to hold a block with a mass of 6.80kg against a vertical wall using only the Force. Luke applies the Force with a magnitude of 115.0N at an angle of 52.0° with respect to the horizontal. Luke discovers that if the Force increases any more, the block begins to slide up the wall. What is the coefficient of static friction between the block and the wall? Assume that gravity on Dagobah is the same as gravity on Earth.
A100-kg sofa needs to be moved across a level floor. The coefficient of static friction between the sofa and the floor is 0.40. Two physics students decide to apply a force F!" on the sofa. One student recommends that the force be applied upward at an angle theta above the horizontal. The other student recommends that the force be applied downward at an angle theta below the horizontal. Explain which student has the better idea and why.
Link AB is connected to two massless sliders at A and B. Slider A moves in a frictionless guide, whereas slider B rests on the upper horizontal plane. Determine the maximum horizontal force P that will accelerate the link to the right without lifting off slider B from the upper plane. Determine also the resulting acceleration. Neglect friction. B Gravity 15 kg i 0.5 m i 0.25 m 1 m A
9. A 75 N crate is at rest on an incline that is inclined a 25° above the horizontal. The coefficient of static friction between the crate and the incline is 0.25 and the coefficient of kinetic friction between the crate and the incline is 0.15. (a) What is the minimum magnitude of a force parallel to the incline that will prevent the crate from sliding down the incline? (b) What is the minimum magnitude of the force parallel to the incline that will start the crate to move up the incline? (c) Include a force (or free body) diagram of each situation.
1. A horizontal force P the plane, and a horizontal force P= 350 N is required to just push the block up the plane. Determine the coefficient of static friction between the plane and the crate, and find the weight of the block. 100 N is just sufficient to hold the block from sliding down 30° 2. Blocks A and B weigh 200 N and 150 N, respectively. They are connected together with a cable and placed on the inclined plane. If the angle 0 is gradually increased, determine 0 when the crates begin to slide. The coefficients of static friction between the crates and the plane are HA 0.25 and HB= 0.35.
MY NOTES ASK YOUR TEACHER A Mercedes-Benz 300SL (m = 1750 kg) is parked on a road that rises 20° above the horizontal. (a) What is the magnitude of the normal force? X N 16.1 8 9. (b) What is the static frictional force that the ground exerts on the tires? 5.86 Additional Materials 6. D eBook Submit Answer ?? TOO 2,197 MacBook Air %23 3 4 2 E RO H. D F 3. 2.
2. A 25.0-kg box of textbooks rests on a ramp that makes an angle a with the horizontal. The coefficient of kinetic friction is 0.25, and the coefficient of static friction is 0.35. (a) As the angle a is increased, find the minimum angle at which the box starts to slip. (Ans: 19.3°) (b) At this angle, find the acceleration once the box has begun to move. (Ans: 0.92 m/s?)