COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 88QAP
To determine
An expression for angle
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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?
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)
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
Ch. 5 - Prob. 1QAPCh. 5 - Prob. 2QAPCh. 5 - Prob. 3QAPCh. 5 - Prob. 4QAPCh. 5 - Prob. 5QAPCh. 5 - Prob. 6QAPCh. 5 - Prob. 7QAPCh. 5 - Prob. 8QAPCh. 5 - Prob. 9QAPCh. 5 - Prob. 10QAP
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- Two blocks of masses m1 and m2, are placed on a table in contact with each other as discussed in Example 5.7 and shown in Figure 5.13a. The coefficient of kinetic friction between the block of mass m1 and the table is 1, and that between the block of mass m2 and the table is 2. A horizontal force of magnitude F is applied to the block of mass m1. We wish to find P, the magnitude of the contact force between the blocks. (a) Draw diagrams showing the forces for each block. (b) What is the net force on the system of two blocks? (c) What is the net force acting on m1? (d) What is the net force acting on m2? (e) Write Newtons second law in the x direction for each block. (f) Solve the two equations in two unknowns for the acceleration a of the blocks in terms of the masses, the applied force F, the coefficients of friction, and g. (g) Find the magnitude P of the contact force between the blocks in terms of the same quantities.arrow_forwardA 2.0 kg box is at rest on a flat horizontal surface. A continuously applied force is then exertedon the box. When the applied force just exceeds 5.0N the box then begins to move. Q1. Construct a free-body diagram for the box at the moment when the applied force is 5.0N. Q2. Determine the magnitude of the peak static friction force and the corresponding coefficientof static friction.arrow_forwardA 6.00 kg box is pulled horizontally with a 40.0 N force that makes an angle of 50.0° with the horizontal. The coefficient of kinetic friction between the surface and the box is 0.230. Calculate the magnitude of the normal force and the acceleration of the box.arrow_forward
- (II) On an icy day, you worry about parking your car in your driveway, which has an incline of 12°. Your neighbor’s driveway has an incline of 9.0°, and the driveway across the street is at 6.0°. The coefficient of static friction between tire rubber and ice is 0.15. Which driveway(s) will be safe to park in?arrow_forwardA person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 591 N. As the elevator later stops, the scale reading is 391 N. Assuming the magnitude of the acceleration is the same during starting and stopping, determine (a) the weight of the person, and (b) the acceleration of the elevator.arrow_forwardWhen an ice hockey puck weighing 90 g is stationary on the ice, a minimal force of 0.2 N is required to move it. a) Calculate the coefficient of static friction. b) If the puck covers the first 10 cm in 0.5 s (while the 0.2 N force is still applied on the puck), calculate the kinetic friction coefficient.arrow_forward
- 8 - 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_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_forward8. An object is pulled across a rough horizontal surface with an applied force of 300 N [40o below the horizontal]. The applied force is slowly rotated down toward the horizontal, decreasing the 40o angle. What will happen to the force of friction acting on the object and the acceleration? a. Both increase.b. Both decrease.c. Friction decreases and acceleration increases.d. Friction increases and acceleration decreases.e. None of the above statements are accurate.arrow_forward
- Suppose m1 and m2 in Example 6-14(Atwood’s Machine) are both increased by 1 kg. Does the acceleration of the blocks increase, decrease, or stay the same? (b) Choosethe best explanation from among the following:I. The net force acting on the blocks is the same, but the totalmass that must be accelerated is greater.II. The difference in the masses is the same, and this is what determines the net force on the system.III. The force exerted on each block is greater, leading to an increased acceleration.arrow_forwardWhy do you feel thrown to the outside when a car in which you are riding goes around a curve, even though there is no force acting on you in that direction? simple explanationarrow_forwardEstimate the magnitude of the normal force acting on an apple that rests on a flat surface. Estimate the magnitude of the normal force on the apple when the surface is tilted at an angle of 29∘ with respect to the horizontal.arrow_forward
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