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Review. Three forces acting on an object are given by
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Chapter 5 Solutions
Physics for Scientists and Engineers
- You are pushing a wooden crate against a rubber floor. The two surfaces have a static coefficient of friction of 0.45 and a kinetic coefficient of friction of 0.38. The floor is horizontal, and the crate has a mass of 25.0 kg, and is initially at rest. You are pushing with a horizontal force of 155 N. What is the magnitude of the force of friction in this case? Give your answer in units of N, to three significant figures.arrow_forwardIn (Figure 1), F={300i-100j+550k}NF= (300i-100j+550k)N. Determine the magnitude of the projection of the force FF acting along the cable BA◆◆. Express your answer to three significant figures and include the appropriate units. Figure 2m 6m 1 of 1 3marrow_forwardThree forces acting on an object are given by F1 = (−1.9î + 5.80ĵ) N, F2 = (4.95î − 2.15ĵ) N, and F3 = (−44î) N. The object experiences an acceleration of magnitude 3.60 m/s2.arrow_forward
- A fish swimming in a horizontal place has velocity v, = (4.0î + 1.0j)m/s at a point in the ocean where the position relative to a rock is ř, = (10.01 – 4.05)m. After the fish swims with constant acceleration for 20 sec its velocity is v = (20.0î – 5.05)m/s. A) What are the components of the acceleration? B) What is the direction of the acceleration with respect to unit vector f? C) If the fish maintains constant acceleration, where is it at t=2.5 s, and in what direction is it moving?arrow_forwardA cart of mass 8.00 kg was moved by applying two constant forces. Force 1 is 28.0 N at 42.0°, and Force 2 is 13.0 N at 110°. Initially, the cart has a velocity of (3.50 i +2.20 j) m/s. a. Express the two forces in in unit-vector notation. Ans. F = (20.81 i+ 18.74 j)N, F, =(-4.45 i+ 12.22 j)N b. Find the total force exerted on the cart. Ans. EF = (16.36 i + 30.96 j)N or 35.02 N c. Find the angle at which the total force is applied. Ans. 62.15º d. What is the acceleration of the cart? Ans. å = (2.05 i + 3.87 j)" or 4.38 EERINarrow_forwardA cart of mass 8.00 kg was moved by applying two constant forces. Force 1 is 28.0 N at 42.0°, and Force 2 is 13.0 N at 110°. Initially, the cart has a velocity of (3.50 i +2.20 j) m/s. a. Express the two forces in in unit-vector notation. Ans. F = (20.81 i + 18.74 j)N, F, = (-4.45 i + 12.22 j)N b. Find the total force exerted on the cart. Ans. EF = (16.36 i + 30.96 j)N or 35.02 N Find the angle at which the total force is applied. Ans. 62.15° NEERINarrow_forward
- A cart of mass 8.00 kg was moved by applying two constant forces. Force 1 is 28.0 N at 42.0°, and Force 2 is 13.0 N at 110°. Initially, the cart has a velocity of (3.50 i +2.20 j) m/s. a. Express the two forces in in unit-vector notation. Ans. F = (20.81 i + 18.74 j)N, F, = (-4.45 i + 12.22 j)N b. Find the total force exerted on the cart. Ans. EF = (16.36 i+ 30.96 j)N or 35.02 N c. Find the angle at which the total force is applied. Ans. 62.15°arrow_forwardAn 800 kg boulder is raised from a quarry 183 m deep by a long, uniform chain having a mass of 560 kg. This chain is of uniform strength, but at any point it can support a maximum tension no greater than 2.50 times its weight without breaking. What is the maximum acceleration the boulder can have and still get out of the quarry?arrow_forwardYou are pushing a rubber crate against a concrete floor. The two surfaces have a static coefficient of friction of 0.61 and a kinetic coefficient of friction of 0.49. The floor is horizontal, and the crate has a mass of 25.0 kg, and is initially at rest. You are pushing with a horizontal force of 100 N. What is the magnitude of the force of friction in this case? Give your answer in units of N, to three significant figures.arrow_forward
- Problem Seventeen. Objects of masses m₁ = 4.0 kg and m₂ = 9.0 kg are connected by a light string that passes over a frictionless pulley in the figure. The object m₁ is held at rest on the floor, and m₂ rests on a fixed incline of € = 40.5°. The objects are released from rest, and m₂ slides 1.3 m down the slope of the incline in 3.95 s. 23.) Find the magnitude of the acceleration (in m/s²) of either mass. (A) 2.0 (D) 0.17 (B) 4.0 (E) 0.13 (C) 9.8 m1 24.) Find the coefficient of kinetic friction between m₂ and the incline. (A) 0.58 (B) 0.30 (C) 0.24 (D) 0.085 m2 (E) 1.64arrow_forwardYou are pushing a rubber crate against a concrete floor. The two surfaces have a static coefficient of friction of 0.66 and a kinetic coefficient of friction of 0.52. The floor is horizontal, and the crate has a mass of 25.0 kg, and is initially at rest. You are pushing with a horizontal force of 85 N. What is the magnitude of the force of friction in this case? Give your answer in units of N, to three significant figures. You are pushing a wooden crate against a rubber floor. The two surfaces have a static coefficient of friction of 0.54 and a kinetic coefficient of friction of 0.42. The floor is horizontal, and the crate has a mass of 25.0 kg, and is initially at rest. You are pushing with a horizontal force of 135 N. What is the magnitude of the force of friction in this case? Give your answer in units of N, to three significant figures.arrow_forwardAn elevator filled with passengers has a total mass of 1960 kg and is suspended from a single cable. The elevator rises to the top floor in the following three stages of motion: First, starting from rest on the ground floor, it accelerates upward at 0.81 m/s2 for 1.85 s. Next, it travels at constant speed for 5.03 s. Finally, is slows with an acceleration of magnitude 0.34 m/s2 until it comes to rest at the top floor. Assume the only two forces on the elevator are the tension in the cable and gravity. What is the distance, in meters, from the ground floor to the top floor?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning