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A 72-kg water skier is being accelerated by a ski boat on a flat (“glassy") lake. The coefficient of kinetic friction between the skier's skis and the water surface is
Figure 4-74
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Physics: Principles and Applications -- Pearson e Text Instant Access (Pearson+)
- A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?arrow_forwardA 50 kg box is pushed with a force of 200 N along a horizontal surface. If the coefficient of friction between the box and the surface is 0.3, calculate the acceleration of the box. (Note: The gravitational acceleration can be assumed to be 9.8 m/s² unless stated otherwise.)arrow_forwardAn 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k = 0.2. The maximum force that can be applied to the block so that it does not move is?arrow_forward
- BodyA in Fig. 6-33 weighs 102 N, and body B weighs 32 N. The coefficients of friction between A and the incline are us =0.56 and uk=0.25. Angle 0 is 40°. Let the positive direction of an x axis be up the incline. In unit-vector notation, what is the acceleration of A if A is initially (a) at rest, (b) moving up the incline, and (c) moving down the incline Frictionless, massless pulleyarrow_forward15-7. Crates A and B weigh 100 lb and 50 lb, respectively. If they start from rest, determine their speed when t = 5 s. Also, find the force exerted by crate A on crate B during the motion. The coefficient of kinetic friction between the crates and the ground is µ = 0.25. A P = 50 lbarrow_forwardA 100-kg bale of hay falls of a truck traveling along a level road at 24.4 m/s. It lands flat on the road and slides 100 m before coming to rest. Assume the acceleration is constant, compute the coefficient of kinetic friction between the road and the hay. {µk = 0.30}arrow_forward
- A person slides a bottle with mass 0.20 kg along a level table. It leaves his hand at 2.8 m/s and comes to a halt after going 1.0 m. Find the coefficient of kinetic friction between the bottle and the table.arrow_forwardSuppose you have a 120 kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.arrow_forwardA 2000 kg trailer truck travels down a road with slope 0.2 with a speed of 20 kph. If the truck driver pressed the brakes hard, determine how far the tires skid on the road if the coefficient of kinetic friction between the wheels and the road is 0.6.arrow_forward
- The driver of a car applies the brakes, and the car starts to skid. If the coefficient of friction between the car's tires and the ground is 0.7, then what acceleration does the car experience?arrow_forwardA man was originally walking at 1.5 m/s and then reaches a speed of 8.1 m/s in 2.4 s. He estimated that his coefficient of friction was 0.30. Was it above or below this value?arrow_forward4-61. The drum has a weight of 500 N and rests on the floor for which the coefficient of static friction is 4, = 0.5. If a = 0.9 m and b= 1.2 m, determine the smallest magnitude of the force P that will cause impending motion of the drum.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
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