COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 45QAP
To determine
The force applied to the object.
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A 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 block
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.
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 above
Chapter 5 Solutions
COLLEGE PHYSICS
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- 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.arrow_forwardA 70.0 kg box is being pulled along a horizontal surface. The coefficient of kinetic friction between the box and the ground is 0.250. What horizontal force must be exerted on the box for it to accelerate at 1.20 m/s2arrow_forwardQ4;The figure below shows a box with a mass of m = 2.70 kg on a surface inclined at an angle of 35.0°. The coefficient of static friction between the box and the surface is 0.275. Find the minimum magnitude of the force F (in N), applied to the box in a direction perpendicular to the surface, that will prevent the box from sliding down the surface. A rectangular box of mass m is positioned on an inclined surface of angle 35.0° (measured counterclockwise from the horizontal). A force, vector F, is applied down and right on the box, perpendicular to the incline.arrow_forward
- 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?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_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
- 1. Explain why the following situation is impossible. Your 3.80 kg physics book is placed next to you on the horizontal seat of your car. The coefficient of static friction between the book and the seat is 0.650, and the coefficient of kinetic friction is 0.550. You are travelling forward at 72.0 km/h and you hit the brakes to a stop with a constant acceleration over a distance of 30.0 m. Your physics book remains on the seat rather than sliding forward onto the floor.arrow_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_forward4. A 28.0 kg crate is being push across a horizontal floor with a force F = 155 N that makes an angle θ = 28.0° with the horizontal as illustrated in the figure below. Find the magnitude of the acceleration of the crate, given that the coefficient of kinetic friction between the crate and the floor is 0.13.arrow_forward
- 9 - The force F applied to an object with a mass of 4 kg on a horizontal plane gives an acceleration of 5 m / s2. Since the friction coefficient between the body and the acceleration is 0.25, how many N is the force F?A) 45B) 15C) 25D) 20E) 30arrow_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 7.62-kg box is pulled along a horizontal surface by a 75.8-N force applied at a 15.1 degree angle above the horizontal. The coefficient of kinetic friction between the box and the surface is 0.209. Calculate the acceleration (in m/s2).arrow_forward
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