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Review. Three forces acting on an object are given by
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Chapter 5 Solutions
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- A man pushes an object to the right and exerts a force which has a horizontal compotent of F = 33 N. A horizontal frictional force has a magnitude of f = 15 N which opposed the horizontal component of the fushing force. The mass of the object is m = 31 kg. Write an expression for the magnitude of the acceleration of the object. If the object starts at rest what is the speed in meters per second at t = 2.00s? If the man stops pushing the object at t = 2.00s and the firctional force is constant what is the distance in meters does to object slide before coming to a rest?arrow_forwardFor V1=V1x^(unit vector) and V2=V2x^, it is V1>0 and V2<0. Accelerations are a1=a1x^, a2=a2x^and a3=a3y^. ropes and pulleys are massless and frictionless. Solve the problem using the coordinate system given in the figure. For m1=m2, find a1, a2, a3 in terms of (m1, m2, m3, g and µ). Hint given in figure 2arrow_forwardYou 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_forward
- In (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_forwardOnly two forces act on an object (mass=3.61 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object. (a) Number (b) Number i 145.0° 1 40.0 N 60.0 N +X Units Unitsarrow_forward
- A cart of mass mA = 7.3 kg is pushed forward by a horizontal force F. A block of mass mB = 0.54 kg is in turn pushed forward by the cart. If the cart and the block accelerate forward fast enough, the friction force between the block and the cart would keep the block suspended above the floor without falling down. Given g = 9.8 m/s2 and the static friction coefficient μs = 0.8 between the block and the cart; the floor is horizontal and there is no friction between the cart and the floor. Calculate the minimal force F on the cart that would keep the block from falling down.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_forwardA crate of mass m = 2.00 kg is released from rest at the top of an inclined plane as seen in the figure. The crate starts out at height = 0.100 m above the top of the table, the table height is H = 2.00 m, and 0 = 41.0⁰. H ↑ h i (a) What is the acceleration (in m/s2) of the crate while it slides down the incline? m/s² m (b) What is the speed (in m/s) of the crate when it leaves the incline? m/s (c) At what horizontal distance (in m) from the end of the table will the crate hit the ground? m O No (d) How long (in s) from when the crate is released does it hit the ground? S (e) Does the crate's mass affect any of your above answers? Yesarrow_forward
- You 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_forwardProblem 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_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