COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 44QAP
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In this problem we have to determine acceleration of the mop head if the coefficient of kinetic friction between the head & the floor is
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You are designing a high-speed elevator for a new skyscraper. The elevator will have a mass limit of 2400 kg (including passengers). For passenger comfort, you choose the maximum ascent speed to be 18.0 m/s, the maximum descent speed to be 10.0 m/s, and the maximum acceleration magnitude to be 3.30 m/s2. Ignore friction. What is the minimum value of a 60.0-kg passenger’s apparent weight during the ascent?
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) 30
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
Chapter 5 Solutions
COLLEGE PHYSICS
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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.arrow_forward1-) B (weight = 75N) is placed on A (weight = 50N). static coef. of friction=0.25, kinetic coef. of friction =0.20 (between A and B). Determine maximum possible P force with no slippage between objects and the corresponding acceleration if (a) P is applied on A or (b) P is applied on B.arrow_forward1. 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_forward
- During 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_forwardOne 3.6-kgkg paint bucket is hanging by a massless cord from another 3.6-kgkg paint bucket, also hanging by a massless cord. a) If the two buckets are pulled upward with an acceleration of 1.25 m/s^2 by the upper cord, calculate the tension in the top cord. b) If the two buckets are pulled upward with an acceleration of 1.25 m/s^2 by the upper cord, calculate the tension in the bottom cord.arrow_forwardA box with mass 13.0 kg moves on a ramp that is inclined at an angle of 55.0∘ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is μk = 0.300. a. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 150.0 N that is parallel to the ramp surface and directed down the ramp, moving the box down the ramp. b. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 150.0 N that is parallel to the ramp surface and directed up the ramp, moving the box up the ramp.arrow_forward
- an adventurous archeologist crosses between two rocks cliffs, with a ranging river far below, by slowly going hand over hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope. The rope will break if the tension in it exceeds 3.00 x 10⁴N, and our heros mass is 81.6 kg. a. if the angle that the rope makes with the cliff is 75°find the tension in the rope. b. What is the smallest value the angle can have if the rope is not to break?arrow_forward8 - I. The effect that makes the movement of objects difficult is called friction force.II. The friction force is in the opposite direction to the motion.III. The friction force depends on the characteristics of the friction surface.IV. Friction force is inversely proportional to reaction force.Which of the following are / are the correct statements regarding the friction force? A) I-II-IIIB) II-III-IVC) II-IIID) I-II-III-IVE) I-III-IVarrow_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_forward
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