COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 50QAP
To determine
The mass of the hanging block 1.
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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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8-63. Determine the smallest force P that will cause
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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
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O
O
O
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A
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Chapter 5 Solutions
COLLEGE PHYSICS
Ch. 5 - Prob. 1QAPCh. 5 - Prob. 2QAPCh. 5 - Prob. 3QAPCh. 5 - Prob. 4QAPCh. 5 - Prob. 5QAPCh. 5 - Prob. 6QAPCh. 5 - Prob. 7QAPCh. 5 - Prob. 8QAPCh. 5 - Prob. 9QAPCh. 5 - Prob. 10QAP
Ch. 5 - Prob. 11QAPCh. 5 - Prob. 12QAPCh. 5 - Prob. 13QAPCh. 5 - Prob. 14QAPCh. 5 - Prob. 15QAPCh. 5 - Prob. 16QAPCh. 5 - Prob. 17QAPCh. 5 - Prob. 18QAPCh. 5 - Prob. 19QAPCh. 5 - Prob. 20QAPCh. 5 - Prob. 21QAPCh. 5 - Prob. 22QAPCh. 5 - Prob. 23QAPCh. 5 - Prob. 24QAPCh. 5 - Prob. 25QAPCh. 5 - Prob. 26QAPCh. 5 - Prob. 27QAPCh. 5 - Prob. 28QAPCh. 5 - Prob. 29QAPCh. 5 - Prob. 30QAPCh. 5 - Prob. 31QAPCh. 5 - Prob. 32QAPCh. 5 - Prob. 33QAPCh. 5 - Prob. 34QAPCh. 5 - Prob. 35QAPCh. 5 - Prob. 36QAPCh. 5 - Prob. 37QAPCh. 5 - Prob. 38QAPCh. 5 - Prob. 39QAPCh. 5 - Prob. 40QAPCh. 5 - Prob. 41QAPCh. 5 - Prob. 42QAPCh. 5 - Prob. 43QAPCh. 5 - Prob. 44QAPCh. 5 - Prob. 45QAPCh. 5 - Prob. 46QAPCh. 5 - Prob. 47QAPCh. 5 - Prob. 48QAPCh. 5 - Prob. 49QAPCh. 5 - Prob. 50QAPCh. 5 - Prob. 51QAPCh. 5 - Prob. 52QAPCh. 5 - Prob. 53QAPCh. 5 - Prob. 54QAPCh. 5 - Prob. 55QAPCh. 5 - Prob. 56QAPCh. 5 - Prob. 57QAPCh. 5 - Prob. 58QAPCh. 5 - Prob. 59QAPCh. 5 - Prob. 60QAPCh. 5 - Prob. 61QAPCh. 5 - Prob. 62QAPCh. 5 - Prob. 63QAPCh. 5 - Prob. 64QAPCh. 5 - Prob. 65QAPCh. 5 - Prob. 66QAPCh. 5 - Prob. 67QAPCh. 5 - Prob. 68QAPCh. 5 - Prob. 69QAPCh. 5 - Prob. 70QAPCh. 5 - Prob. 71QAPCh. 5 - Prob. 72QAPCh. 5 - Prob. 73QAPCh. 5 - Prob. 74QAPCh. 5 - Prob. 75QAPCh. 5 - Prob. 76QAPCh. 5 - Prob. 77QAPCh. 5 - Prob. 78QAPCh. 5 - Prob. 79QAPCh. 5 - Prob. 80QAPCh. 5 - Prob. 81QAPCh. 5 - Prob. 82QAPCh. 5 - Prob. 83QAPCh. 5 - Prob. 84QAPCh. 5 - Prob. 85QAPCh. 5 - Prob. 86QAPCh. 5 - Prob. 87QAPCh. 5 - Prob. 88QAPCh. 5 - Prob. 89QAPCh. 5 - Prob. 90QAP
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- A child of mass m swings in a swing supported by two chains, each of length R. If the tension in each chain at the lowest point is T, find (a) the childs speed at the lowest point and (b) the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)arrow_forwardAn 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_forwardIf you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall.arrow_forward
- A sled and rider have a total mass of 56.8 kg. They are on a snowy hill accelerating at 0.7g. The coefficient of kinetic friction between the sled and the snow is 0.18. What is the angle of the hills slope measured upward from the horizontal? You may find a spreadsheet program helpful in answering this question.arrow_forwardIn a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 3.5 kg book is pushed from rest through a distance of 0.83 m by the horizontal 31 N force from the broom and then has a speed of 1.0 m/s, what is the coefficient of kinetic friction between the book and floor? Number Unitsarrow_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
- 6) Consider the four situations shown. All blocks are stationary and have the same weight hanging from the strings shown. The circles are very light, frictionless pulleys. The scale measures the tension force of the string. In which case does the scale measure the largest tension? scale Case A scale Case B scale Case C scale Case Darrow_forwardPulley 1 51° 72.5 35 kg kg Bench Hs = 0.66 = 0.325 -Three objects are connected by weightless flexible strings as shown in the figure. The pulley has no appreciable mass or friction, and the string connected to the block on the horizontal bench pulls on the block parallel to the bench surface. The coefficients of friction between the bench and the block on it are u = 0.66 and Hx =0.325. You observe that this system remains at rest. Answer the following questions. Show all work. Clearly indicate any fundamental principles used. a. Draw a force diagram for the 35 kg block. b. Draw a force diagram for the point connecting the three ropes. c. Calculate the mass of block A. d. Draw a force diagram for tlhe 72.5 kg block. e. Calculate the friction force between the 72.5 kg block and the bench.arrow_forwardA 20 N object is sitting on a flat surface. The coefficient of static friction is 0.4. The coefficient of kinetic friction is 0.2. What is the magnitude of the motive force? a) ON b) 4 N c) 196.2 N O d) 20 N e) 8 Narrow_forward
- 9) 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_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_forwardA crate begins to accelerate along the surface of a ramp as shown after it has been placed at the top of the inclined ramp. Which of the following statements is correct about the magnitude of the kinetic frictional force that acts on the crate? OIt is equal to the component of the crate's weight parallel to the surface of the ramp. Ol is greater than the component of the crate's weight parallel to the surface of the ramp. O Il is less than the component of the crate's weight parallel to the surface of the ramp. M Opuion eninarrow_forward
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