fyO JaG aG ipG toG toocps.instructure.com/courses/1448882/assignments/23625860?module_item_id%3D44257219EDngCoefficients of Friction1. Once the crate in Sample Problem D is in motion, a horizontal force of53 N keeps the crate moving with a constant velocity. Find u the coeffi-cient of kinetic friction, between the crate and the floor. fyG.O JaOCBC BCLM!!G aG iptoG toocps.instructure.com/courses/1448882/assignments/23625860?module_item_id=442572192. A 25 kg chair initially at rest on a horizontal floor requires a 165 N hori-zontal force to set it in motion. Once the chair is in motion, a 127 N hor-izontal force keeps it moving at a constant velocity.a. Find the coefficient of static friction between the chair and the floor.b. Find the coefficient of kinetic friction between the chair and the floor.

Note: In part (1) missing data of part (D). Part (2): Given: The mass of the object is 2 kg. The…

Answered: 2. A 25 kg chair initially at rest on a…

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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Explain Newton's second Law and solve related problems Given a block which is at rest on a perfectly flat smooth table. You push with your hand horizontally on the block with some force. If the mass of the block = 2.00 kg and the acceleration of the block = 5.00 m/s2 then what is the force on the block from your hand in SI units? a. 2.50 N b. 0.100 N c. 0.400 N d. 10.0 N e. zero
Two blocks, joined by a string, have masses of 6.0 and 9.0 kg. They rest on a frictionless horizontal surface. A 2nd string, attached only to the 9-kg block, has horizontal force = 30 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks. a. 18N b. 28N c. 12N d. 15N
A person pushes a box with a small constant force to move the box along the floor at a constant speed in a straight-line path. Which of the following statements is true? a. The net force on the box is zero. b. There are no other forces on the box (besides the person’s push.) c. The net force on the box must be greater than zero to keep the box moving. d. The box has an acceleration that is not zero. e. [Both (c) and (d) are true.]
3. Two blocks A and B are connected by a rope and pulled with some force F along a frictionless horizontal surface, as shown. B a. Draw a free-body diagram for each block. b. Write Newton's second law for each block and obtain equations for the x and y directions. c. If the tension in the rope is given by T = F/3, find the ratio of the masses, ma/mg.
A. A 200 kg block slides along a ramp with an angle of inclination 0 = 38°. The coefficient of friction between the block and ramp is 0.14. What is the acceleration of the block? a = gsine - ugcose B. If there is no friction between the block and the ramp, meaning the coefficient of friction between the block and the ramp is 0, What is the acceleration of the block in this case?
3. Am=12.0 kg object is placed on a bathroom scale in an elevator. a. Draw a free body diagram of the object. Label the forces. Determine the apparent weight (the weight that would show in the scale) of the object if. b. The elevator is at rest. c. The elevator is rising at a constant velocity. d. The elevator is accelerating upward at 1.5 m/s/s. m e. The elevator is accelerating downward at 1.5 m/s/s. f. The elevator is accelerating downward at 10 m/s/s.
C. a. 1. Alan (m = 50 kg) and Diego (m = 40 kg) are standing on a frictionless ice rink, facing each other, when Alan pushes Diego. Diego moves with an acceleration of 1 m/s². What is the magnitude of Alan's acceleration? a. .8 m/s² b. 1.0 m/s² c. 1.25 m/s² d. Cannot be determined 2. How much horizontal force must a girl apply to a 50 kg cabinet to accelerate it at .4 m/s² along a horizontal surface if there is a friction force of 70 N? b. 50 N e. 90 N 3. Students design an experiment to determine the relationship between mass and acceleration where a cannon fires varying masses. Motion sensors are used to measure the velocity of the cannon ball while it is in the cannon. A graph of one of the trials is shown to the right. The mass is then increased for the next trial while keeping everything else the same. What should the velocity vs. time graph look like for this next trial? The second trial is the dashed line. 120 100 80 60 40 20 0 0 120 100 80 60 40 20 a. 20 N d. 80 N D Velocity…
16. Running without friction is impossible. In fact, to maximize your acceleration, you need to maximize the static friction between your shoes and the floor. a) Explain why static friction is necessary for running or walking. requirement, employees' shoes must have a coefficient of static friction of 0.5 or more on a specified tile surface. In an emergency, what is the minimum time interval in which a postal worker starting from rest can move a distance of 3 m on the tile surface? c) A typical athletic shoe has a coefficient of static friction of 0.8 when used on a running track. What is the minimum time interval in which an athlete starting from rest can move a distance of 100 m on a running track? b) To meet a U.S. Postal Service
A force 450 N pushes on a 30.7 kg box at an angle of 50° from the horizontal. Starting from rest , the box achieves a velocity of 16.37 m/s in a time of 3.7 s. Find the coefficient of kinetic friction between the box and the floor. a. 0.24 b. 0.45 c. 0.51 d. 0.35 A child on a sled has been given a push so that he is moving up a hill. The hill is covered with icy snow and can be treated as frictionless. The child has a mass of 22.7 kg; the sled has a 3.18 kg. How far will he go before coming to a stop if his speed is 2.44 m/s when he starts at the bottom of the hill? He holds on tightly and so does not fall off the sled, and the hill makes an angle of 25.50 with the horizontal. a. 0.29 m b. 1.14 m c. 1.41 m d. 0.70 m
The block shown is pulled across the rough horizontal surface at a constant speed by the force shown. If m-15 kg, F=10, and 0 = 37°, what is the coefficient of kinetic friction between the block and the surface? consider g = 10 m/s2. A. 0.2055 B. 0.1555 C. 0.05547 D. None E. 0.2555
B4

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