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Concept explainers
In the situation described in Problem 41 and Figure P5.41, the masses of the rope, spring balance, and pulley are negligible. Nick’s feet are not touching the ground. (a) Assume Nick is momentarily at rest when he stops pulling down on the rope and passes the end of the rope to another child, of weight 440 N, who is standing on the ground next to him. The rope docs not break. Describe the ensuing motion. (b) Instead, assume Nick is momentarily at rest when he ties the end of the rope to a strong hook projecting from the tree trunk. Explain why this action can make the rope break.
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Chapter 5 Solutions
Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 10th + WebAssign Printed Access Card for Serway/Jewett's Physics for Scientists and Engineers, 10th, Multi-Term
- The x and y coordinates of a 4.00-kg particle moving in the xy plane under the influence of a net force F are given by x = t4 6t and y = 4t2 + 1, with x and y in meters and t in seconds. What is the magnitude of the force F at t = 4.00 s?arrow_forwardFIGURE P5.49 Problems 49 and 50. Suppose the system of blocks in Problem 49 is initially held motionless and, when released, begins to accelerate. a. If m1 = 7.00 kg, m2 = 2.00 kg, and the magnitude of the acceleration of the blocks is 0.134 m /s2, find the magnitude of the kinetic frictional force between the second block and the ledge. b. What is the value of the coefficient of kinetic friction between the block and the ledge?arrow_forwardA 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t2 1 and y = 3t3 + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.00 s.arrow_forward
- An aluminum block of mass m1 = 2.00 kg and a copper block of mass m2 = 6.00 kg are connected by a light string over a frictionless pulley. They sit on a steel surface as shown in Figure P5.46, where = 30.0. (a) When they are released from rest, will they start to move? If they do, determine (b) their acceleration and (c) the tension in the string. If they do not move, determine (d) the sum of the magnitudes of the forces of friction acting on the blocks. Figure P5.46arrow_forwardA 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?arrow_forwardTwo boxes with masses m1 = 4.00 kg and m2 = 10.0 kg are attached by a massless cord passing over a frictionless pulley as shown in Figure P5.79. The incline is frictionless, and = 30.0. a. Draw a free-body diagram for each of the boxes. b. What is the magnitude of the acceleration of the boxes? c. What is the tension in the cord connecting the boxes? d. What is the speed of each of the boxes 3.00 s after the system is released from rest? FIGURE P5.79arrow_forward
- A light rope is attached to a block m, = 6.00kg that rests on a frictionless, horizontal surface. The horizontal rope passes over a frictionless, massless pulley, and a block with mass m, is suspended from the other end. When the blocks are released, the tension in the rope is 17.0N. (a) (b) m2 Draw two free-body diagrams: one for each block. What is the acceleration of either block? Find m2. How does the tension compare to the weight of the hanging block? Why? (d)arrow_forwardA(n) 927 kg drag race car accelerates fromrest to 115 km/h in 1.11 s. What average force is exerted on the car?Answer in units of N.arrow_forwardA(n) 878 kg drag race car accelerates from rest to 102 km/h in 0.962 s. What average force is exerted on the car?Answer in units of N.arrow_forward
- Block B has mass 5.00 kg and sits at rest on a horizontal,frictionless surface. Block A has mass 2.00 kg and sits at rest on topof block B. The coefficient of static friction between the two blocksis 0.400. A horizontal force P is then applied to block A. What is thelargest value P can have and the blocks move together with equalaccelerations?arrow_forwardThree crates with various contents are pulled by a force Fpull 3677 N across a horizontal, frictionless roller-conveyor system. The group of boxes accelerates at 1.430 m/s? to the right. Between each adjacent pair of boxes is a force meter that measures the magnitude of the tension in the connecting rope. Between the box of mass m¡ and the box of mass m2, the force meter reads F12 1397 N. Between the box of mass m2 and the box of mass m3, the force meter reads F23 = 2351 N. Assume that the ropes and force meters are massless. m, m2 m3 F pull FRAGILE FRAGILE FRAGILE F. 12 F. 23 What is the total mass of the three boxes? Mtotal kg What is the mass of each box? kg m2 kg IIarrow_forwardAfter visiting a delicatessen in the local mall, a student takes the elevator down to the parking garage and uses a spring scale to "weigh" his pastrami sandwich. At a certain instant of time, the elevator, student and sandwich are moving down at a speed of 2.00 m s² 1.00 m/s, and speeding up at a rate of At this instant of time, the spring scale reading is 5.60 N. 24. The weight of the pastrami sandwich is equal to C. 4.65 N. A. 5.60 N. В. 6.74 N. D. 7.04 N. E. 6.24 N. 25. The resultant force acting on the sandwich is equal to A. 1.27 N up. B. 1.44 N down. C. 1.27 N down. D. 1.38 N up. E. 0.949 N up.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
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