COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 65QAP
To determine
The tension produced in the wire by the bird.
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A box weighing 66.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end (Fig. 4-37). Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs (a) 30.0 N, (b) 60.0 N, and (c) 90.0 N.
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
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.
Chapter 4 Solutions
COLLEGE PHYSICS
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- Describe a situation in which the net external force on a system is not zero, yet its speed remains constant.arrow_forwardAs a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 61.0 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 6.00 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine (a) the salmons acceleration and (b) the magnitude of the force F during this interval.arrow_forward25- A Hospital bed requires a frictional force Fr to keep it moving with constant velocity across a floor. If the coefficient of friction is μ, then the normal force N is given by: A.μ /Fr B.μ Fr C.Fr /μ D.Fr E.μarrow_forward
- 28-A traffic light with a weight of 122 N is suspended from a support with cables, making angles of 37° and 530° with the horizontal as shown in the figure. According to this; Find the tension T3 according to the figure. A) 122 N B) 90,1 N C) 97,5 N D) 79,9 N E) 95,1 Narrow_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_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_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 coefficient of static friction between a persons shoe and the ground is 0.80. Determine the maximum magnitude of acceleration of a 60 kg person, if he starts running on a horizontal surface from rest.arrow_forwardA pickup truck carries cans of paint in the back bed. The coefficient of static friction between the cans and the bed of the truck is 0.30. There is no back gate to the truck. How long should the driver take to accelerate to a speed of 65 mi/h to avoid losing the paint cans out of the rear of the truck?arrow_forward
- 10. The two blocks are attached to each other by a massless string that is wrapped around a frictionless pulley. When the bottom 9.00-kg block is pulled to the left by the constant force P. The top 6.00-kg block slides across it to the right. Find the magnitude of the force necessary to move the blocks at constant speed. Assume that the coefficient of kinetic friction between all surfaces is 0.700.arrow_forwardDetermine: - tension force (N) at block A - resultant force of the friction and normal force (N) between block A and inclined surface - Value of force P (N)arrow_forwardA 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_forward
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