NB: For figure check the attached suppleemnt. A 75.0 N force is applied on a mass of 11.5 kg at an angle of 30.0 degree with the horizontal. Given coefficient of friction between the surfaces is 0.18 Calculate the following quantities [a] Normal force N [b] Frictional force [c] Net force along x direction [d] Acceleration [e] Given initial velocity zero, what distance the object travels in 4.0 s

NB: For figure check the attached suppleemnt. A 75.0 N force is applied on a mass of 11.5 kg at an angle of 30.0 degree with the horizontal. Given coefficient of friction between the surfaces is 0.18 Calculate the following quantities [a] Normal force N [b] Frictional force [c] Net force along x direction [d] Acceleration [e] Given initial velocity zero, what distance the object travels in 4.0 s

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter6: Applications Of Newton's Laws

Section: Chapter Questions

Problem 47P: (a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her...

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A 75.0-kg man stands on a bathroom scale in an elevator that accelerates from rest to 30.0 m/s in 2.00 s. (a) Calculate the scale reading in newtons and compare it with her weight. (The scale exerts an upward force on her equal to its reading.) (b) What Is unreasonable about the result? (c) Which premise is unreasonable, or which premises are inconsistent?
(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise, it is possible to exert forces to the joints that are easily 10 times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pam.
If a single constant force acts on an object that moves on a straight line, the objects velocity is a linear function of time. The equation v = vi + at gives its velocity v as a function of time, where a is its constant acceleration. What if velocity is instead a linear function of position? Assume that as a particular object moves through a resistive medium, its speed decreases as described by the equation v = vi kx, where k is a constant coefficient and x is the position of the object. Find the law describing the total force acting on this object.
Give reasons for the answers to each of the following questions: (a) Can a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the ball be different in magnitude from the force the ball exerts on the floor?
A 9.3-kg box slides across the floor of an elevator with a coefficient of kinetic friction equal to 0.38. (a) What isthe force of kinetic friction acting on the box when the elevator is atrest? (b) If the elevator moves upward with constant acceleration, isthe force of kinetic friction acting on the box greater than, less than,or equal to the value found in part (a)? Explain. (c) Determine theforce of kinetic friction acting on the sliding box when the elevatormoves upward with a constant acceleration of 1.4 m>s2
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A woman exerts a horizontal force of 119 N on a box with a mass of 39.2 kg. If the box doesn't move, what's the magnitude of the static friction force (in N)? What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)
In Fig, a block of mass m =5.00 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of magnitude F =12.0 N at an angle θ=25deg. (a) What is the magnitude of the block’s acceleration? (b) The force magnitude F is slowly increased. What is its value just before the block is lifted (completely) off the floor? (c) What is the magnitude of the block’s acceleration just before it is lifted (completely) off the floor?
A bedroom bureau with a mass of 42 kg, including drawers and clothing, rests on the floor. (a) If the coefficient of static friction between the bureau and the floor is 0.59, what is the magnitude of the minimum horizontal force that a person must apply to start the bureau moving? (b) If the drawers and clothing, with 17 kg mass, are removed before the bureau is pushed, what is the new minimum magnitude?
In the figure, a block of mass m = 3.40 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of magnitude F = 11.9 N at an angle θ = 29.0°. (a) What is the magnitude of the block's acceleration? (b) The force magnitude F is slowly increased. What is its value just before the block is lifted (completely) off the floor? (c) What is the magnitude of the block's acceleration just before it is lifted (completely) off the floor?
A block with a mass of m = 46 kg rests on a frictionless surface and is subject to two forces acting on it. The first force is directed in the negative x-direction with a magnitude of F1 = 10.5 N. The second has a magnitude of F2 = 23.5 N and acts on the body at an angle θ = 23° measured from horizontal, as shown. a) Write an expression for the component of net force, Fnet,x, in the x-direction, in terms of the variables given in the problem statement. b)Write an expression for the magnitude of the normal force, FN, acting on the block, in terms of F2 and the other variables of the problem. Assume that the surface it rests on is rigid. c)Find the block's acceleration in the x-direction, ax, in meters per second squared.
A block with a mass of m = 46 kg rests on a frictionless surface and is subject to two forces acting on it. The first force is directed in the negative x-direction with a magnitude of F1 = 10.5 N. The second has a magnitude of F2 = 23.5 N and acts on the body at an angle θ = 23° measured from horizontal, as shown. a)Write an expression for the component of net force, Fnet,x, in the x-direction, in terms of the variables given in the problem statement. b)Write an expression for the magnitude of the normal force, FN, acting on the block, in terms of F2 and the other variables of the problem. Assume that the surface it rests on is rigid.