Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 5, Problem 23P
(a)
To determine
To describe:The frictional force is to be calculated.
(b)
To determine
To describe:The results is to be calculated when
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The coefficient of kinetic friction between a box and the floor is u, = 0.16 and the coefficient of static friction is u, = 2.0µ.
(a) Calculate the ratio of static to kinetic friction force if m = 9 kg.
(b) Will the ratio change if the value of m is changed but u, still equals 2.0µ?
Yes
No
A 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}
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Chapter 5 Solutions
Physics Fundamentals
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- (a) You want to design a circular racetrack of radius R such that cars of mass M can go around the track at speed w without the aid of friction or other forces other than the perpendicular contact force from the track surface. Find an expression for the required banking angle θ of the track, measured from the horizontal. Your answer should be expressed in terms of M, R, w, and g. (b) Suppose the racecars actually round the track at a speed v > w. What additional radial force is required to keep the cars on the track at this speed? Express your answer in terms of M, R, w, v, and g.arrow_forwardA student of mass 61.4 kg, starting at rest, slides down a slide 19.2 m long, tilted at an angle of 26.10 with respect to the horizontal. If the coefficient of kinetic friction between the student and the slide is 0.118, find the force of kinetic friction, the acceleration, and the speed she is traveling when she reaches the bottom of the slide. (Enter the magnitudes.) HINT (a) the force of kinetic friction (in N) N (b) the acceleration (in m/s) m/s2 (c) the speed she is traveling (in m/s) m/sarrow_forward(a) A flatbed truck moving at 28 m/s carries a steel girder that rests on its wooden floor. The girder is not strapped down, in violation with USDOT regulations. If the coefficient of static friction between steel and wood is 0.52, what is the minimum distance over which the truck can come to a stop without the girder sliding toward the cab of the truck? (answer: 77 m) (b) What is the minimum time over which the truck can accelerate forward from 0 m/s to 28 m/s with a constant acceleration without the girder sliding off the back? (answer: 5.5 s)arrow_forward
- (a) A flatbed truck moving at 28 m/s carries a steel girder that rests on its wooden floor. The girder is not strapped down, in violation with USDOT regulations. If the coefficient of static friction between steel and wood is 0.52, what is the minimum distance over which the truck can come to a stop without the girder sliding toward the cab of the truck? (answer: 77 m) (b) What is the minimum time over which the truck can accelerate forward from 0 m/s to 28 m/s with a constant acceleration without the girder sliding off the back? (answer: 5.5 s) FNET = ma fs,max = UsN W =mg v² = vo² + 2aAx %3D %3D V = Vo+ at g = 9.81 m/s?arrow_forward(a) A flatbed truck moving at 28 m/s carries a steel girder that rests on its wooden floor. The girder is not strapped down, in violation with USDOT regulations. If the coefficient of static friction between steel and wood is 0.52, what is the minimum distance over which the truck can come to a stop without the girder sliding toward the cab of the truck? (answer: 77 m) (b) What is the minimum time over which the truck can accelerate forward from 0 m/s to 28 m/s with a constant acceleration without the girder sliding off the back? (answer: 5.5 s) FNET = ma fs.max = μsn W = mg v² = v₁² + 2aAx V = Vo+ at g=9.81 m/s²arrow_forwardA block (mass = 200.00 g) is placed on an inclined plane 45 degrees from the horizontal. The coefficient of static and kinetic friction between the block and the plane are 0.54 and 0.35, respectively. What is the frictional force between the block and the plane?arrow_forward
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