A 11.1 kg sled is being dragged by a horizontal rope to the left, while slowing down from 45.8 m/s to 7.1 m/s over 0.8 seconds. If the tension in the rope is 39.8 N, then what is the coefficient of friction for the frictional force acting on the sled?
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- An 83 kg man is sliding across his kitchen floor. Between socks and the polished hardwood, the coefficient of the static friction is 0.34 and the coefficient of kinetic friction is 0.17. What is the magnitude of the acceleration of the man as he slows down?A 1280 kg car pulls a 350 kg trailer. the car exerts a horizontal force of 3.6 x 103 N against the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.15 for the trailer.A child is pulling a red wagon full of toys (total mass is 8.15 kg). His pull is 30 N in magnitude and at 22 degrees above the horizontal. He pulls his wagon at a constant acceleration (could be positive or negative). The coefficient of friction between the wagon's wheels and the ground is 0.33. What is the wagon's acceleration?
- A 200 kg crate rests on a floor with carpet. A tired worker pushes with a horizontal force of 600 N on the crate initially resting on a thick pile carpet. The coefficients of static and kinetic friction are 0.60 and 0.40, respectively. Find the magnitude of the frictional force exerted by the surface of the crate by the carpet. Hint: Which type of friction acts in this case? What are the properties of different kinds of friction?A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 4.0 x 10^1 N is being applied to the sled rope at an angle of 11 degrees to the ground, what is the magnitude of the force of friction of the snow acting on the sled?A child is walking along the sidewalk at a constant speed of 1 m/s while pulling his dog sitting in a wagon. The dog has a mass of 30 kg and the wagon weighs 50 N. If the child pulls the wagon with a force of 60 N at an angle of 30°, what is the frictional force exerted by the wagon on the dog?
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