Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 5, Problem 32P
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A block of mass 55.0 kg res IS on a slope having an angle of elevation of25.o0 , If pushing downhill on the block with a force just exceeding 187 Nand parallel to the slope is sufficient to cause the block to start moving, find the coefficient of static friction.
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Chapter 5 Solutions
Physics for Scientists and Engineers
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- A student, crazed by final exams, uses a force of magnitude 80 N and angle u =70 to push a 5.0 kg block across the ceiling of his room ). If the coefficient of kinetic friction between the block and the ceiling is 0.40, what is the magnitude of the block’s acceleration?arrow_forwardIf the strength of the frictional force is equal to the applied force and oppositely directed, and assuming that all other forces may be ignored, the object must be at rest or ____________________.arrow_forwarda block of mass "m" slides down an incline, which makes an angle of 30 degrees with horizontal. if the acceleration of the block is 3.3 m/s^2, then find the coefficient of kinetic frictionarrow_forward
- The 300-N block in the figure is at rest on the roughhorizontal plane before the force P is applied at t=0.The magnitude of P is 80t N, where t is the time inseconds, and its direction is constant. The coefficientsof static and kinetic friction are Ms = 0.40 and Mk0.20, respectively. Which of the following most nearlygives the time when the block starts to slide? Which of the following most nearly gives the value of× if the power developed by the force at a giveninstant is 0.20 hp?arrow_forwardSuppose the coefficient of static friction between a quarterand the back wall of a rocket car is 0.330. At what minimumrate would the car have to accelerate so that a quarter placedon the back wall would remain in place?arrow_forwardIf the coefficient of kinetic friction, , between the block and the surface is 0.30 and the magnitude of the frictional force is 80.0 N, what is the weight of the block? ( Assume the block is on a horizontal surface)arrow_forward
- Suppose a box of mass mm = 5 kg is kicked and given an initial velocity of 5.0 m/s to the right. The box slides along and is brought to rest by friction. What is its total displacement, assuming the coefficient of kinetic friction is 0.60?arrow_forwardWhile the aircraft weighs 5000 kg, accelerates and moves, leaving a load of 150 kg, instantaneous speed, altitude, net engine thrust, wind speed are given. Calculating the distance with the aircraft while the load falls to the ground in a negligible condition of air friction.arrow_forwardSecond Law of Newton states that when there is a net force acting on a body, the body would accelerate in the same direction as the net force with a magnitude that isarrow_forward
- A 5kg crate is simultaneously acted upon by a force of 60N acting to the right that is parallel to the surface, and a force of 10N acting to the left, which makes a 30 degree angle with the horizontal. If the coefficient of kinetic friction is 0.15, then the magnitude of the acceleration of the crate is about _____ m/s2.arrow_forwardA 20.0 kg trunk is pushed across the floor of a moving van by a horizontal force. If thecoefficient of kinetic friction between the trunk and the floor is 0.255, what is the magnitudeof the frictional force opposing the applied force?arrow_forwardA parachutist is falling at a steady rate of 6 m/s. If thecombined mass of the parachutist and the parachute is 90 kg,what is the resisting force exerted by air?arrow_forward
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