COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 44QAP
To determine
In this problem we have to determine acceleration of the mop head if the coefficient of kinetic friction between the head & the floor is
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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.
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Chapter 5 Solutions
COLLEGE PHYSICS
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- An automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forwardAs a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 61.0 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 6.00 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine (a) the salmons acceleration and (b) the magnitude of the force F during this interval.arrow_forwardQuestion 9 A 13 kg object undergoes an acceleration given by a (4 î- 3) m/s?. The magnitude of the resultant force acting on the object equals:arrow_forward
- 3- The student pushes horizontally on a 37 kg box with a force of 115 N. The coefficient friction between the box and the floor is 0.37. What is the frictional force on the crate from the floor? a- 115 b- 230 c-110 d-121arrow_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_forward2) m, m, 2, Two masses are attached by a string over a pulley as shown above. The hanging mass is 4.00 kg and the mass on the ramp is 5.00 kg. The angle of inclination of the ramp is 30.0° and the coefficient of kinetic friction between the mass and ramp is 0.250. The masses are released; what is the acceleration of the hanging mass? What is the minimum coefficient of static friction such that the masses do not move when they are released?arrow_forward
- Question 6 6 of 15 > I Review Pulling the string on a bow back with a force of 21.0 lb , an archer prepares to shoot an arrow. You may want to review (Pages 170 - 172) . Part A If the archer pulls in the center of the string, and the angle between the two halves is 140 ° , what is the tension in the string? ? T = lb Submit Request Answerarrow_forward9) A block is pushed across a horizontal surface by the force shown in the image. If the coefficient of kinetic friction between the block and the surface is 0.30, F = 20 N, and M = 3.0 kg, what is the magnitude of the block's acceleration? Answers: a) 2.8 m/s b) 2.3 m/s c) 1.8 m/s d) 3.3 m/s e) 5.4 m/sarrow_forward5.) -1.7 m A D 1.8 m 2.5m 12 m B 0.75 m Crate D has a mass of 250 kg and Crate C has a mass of 300 kg are in the back of the pickup truck. The pickup truck has a mass of 1200 kg. a.) Calculate the reactions at each of the two front wheels B and two rear wheels A b.) If the static friction is 0.4, and the emergency brake is on, calculated the friction force on the wheels. The person in the car hits the accelerator pedal, and the engine produces a force of 5000 N, does the car move?arrow_forward
- 1. Consider the forces acting on these three changes and list in order of the magnitude of the force starting with the smallest. A --- r B -4 +q +q Find FA Find Fa Find Fe List in order of the magnitudearrow_forward8) Two blocks of masses ml and m2 are oriented as shown in the diagram. The block ml moves on a surface with coefficient of kinetic friction μ1, and the coefficient of static friction between the two blocks is μ2. What is the minimum force F which must be applied to ml such that m2 remains stationary relative to m1? = M2 F FF m2 ml M² (Block 21 Fir² = m₂a Fix/ma 9= F= 12+ mgm, ma Block 1: F-F-F=m, a F-m,gu₁₂ = F12/m2 12 m.g Fimm, gu,arrow_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_forward
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