COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 42QAP
To determine
In this problem we have to determine mass of the object.
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A 10.0 kg box rests on a horizontal floor. The coefficient of static friction is 0.40 and the coefficient of kinetic friction is 0 30. Determine the force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (A) 0, (B) 10 N, (C) 20 N, (D) 38 N, and (E) 40 N.
A 80.0 kg fruit box is initially at rest on a horizontal surface. Salim pulls the bes horizontally with a force F of magnitude 220.0 N. At the same time Ibrahim tries to help Salim by lifting the box with a vertical force P, see figure below. The coefficients of friction for the box and surface are p,= 0.40 and 4,= 0.25. Determine the magnitude of the frictional force acting on the box a) if the magnitude of P is 150.0N b) if the magnitude of P is 280.0 N c) What is the acceleration of the block?
A 2.17-kg object is situated at rest on a horizontal surface with a static friction coefficient of 0.56. Calculate the maximum force of the static friction.
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_forwardA horizontal force of 95.0 N is applied to a 60.0.kg crate on a rough, level surface. If the crate accelerates at 1.20 m/s2, what is the magnitude of the force of kinetic friction acting on the crate? (See Section 4.5.)arrow_forwardA man exerts a horizontal force of 112 N on a refrigerator of mass 42.0 kg. If the refrigerator doesnt move, what is the minimum coefficient of static friction between the refrigerator and the floor? (See Section 4.6.)arrow_forward
- 1. A crate is lying on a plane inclined at an angle ɵ. What is the angle between the weight of the crate and the force exerted by the plane on the crate? a) θ - 180° b) θ c) 180° - θ d) 180° 2. An object is being acted upon by an unbalanced force if a) it is speeding up b) it is slowing down c) it changes its direction d) all of the abovearrow_forwardDuring a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 292 N on the wire. The left section of the wire makes an angle of 10.5° relative to the horizontal and sustains a tension of 412 N. Find the (a) magnitude and (b) direction (as an angle relative to horizontal) of the tension that the right section of the wire sustains.arrow_forwardAn 80-kg block rests on a horizontal plane. Find the magnitude of the force P required to give the block an acceleration of 2.5m/s² to the right. The coefficient of kinetic friction between the block and the plane is μk = 0.25.arrow_forward
- 3.- A truck tows a 400 kg log from a ditch by means of a winch attached to its rear part. Knowing that the winch applies a constant force F and the coefficient of kinetic friction between the ground and the log is 0.5, determine the force F if the log reaches a speed of 0.5 m / s in 1.8 s. Visual representation (Make drawings or diagrams, clearly indicate the vectors and variables involved in the problem, it can be on the drawing)arrow_forwardThe 118-lb force P is applied to the 250-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume ??= 0.48, ??= 0.38.arrow_forwardA 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0 degrees below the horizontal is applied to the box. The coefficients of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box? Draw force diagram. Please provide step-by-step solutionarrow_forward
- A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.59. Force minimum?arrow_forwardA 4.00-kg block starts from rest at the top of a 30.0° incline and slides a distance of 2.30 m down the incline in 1.00 s. (a) Find the magnitude of the acceleration of the block. (b) Find the coefficient of kinetic friction between block and plane. (c) Find the friction force acting on the block. magnitude in N direction(a- up the incline, b- down the incline, c- normal to the incline and upward, d- normal to the incline and downward) (d) Find the speed of the block after it has slid 2.30 m. Thank you!arrow_forwardA 4.0-kg square block is on an incline plane of 30 degrees angle with respect to the ground. 1)What is the minimum coefficient of static friction (μs)min is need to prevent it from sliding down the incline? 2) When the surface μs is 0.30 to prevent the block sliding, a horizontal force F, parallel to the ground, is applied to the block. find the minimum magnitude of F required to keep the block from moving. 3) When a 20 N uphill force is applied to the block, the block starts to move up along the incline. Find the acceleration of the blockarrow_forward
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