e weight of the block in the drawing is 97.0 N. The coefficient of static friction between the block and the vertical wall is 0.430. (a) What minimum magnitude of the force is required to prevent the block from sliding down the wall? (Hint: The static frictional force erted by the block is directed upward, paraliel to the wall.) (b) What minimum force is required to start the block moving up the wall? (Hint: The static frictional force is now directed down the wall.) Block wall ) Number Units p) Number Units

e weight of the block in the drawing is 97.0 N. The coefficient of static friction between the block and the vertical wall is 0.430. (a) What minimum magnitude of the force is required to prevent the block from sliding down the wall? (Hint: The static frictional force erted by the block is directed upward, paraliel to the wall.) (b) What minimum force is required to start the block moving up the wall? (Hint: The static frictional force is now directed down the wall.) Block wall ) Number Units p) Number Units

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter6: Applications Of Newton’s Laws Of Motion

Section: Chapter Questions

Problem 11PQ: In Problem 10, the mass of the sign is 25.4 kg, and the mass of the potted plant is 66.7 kg. a....

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1. 50 kg block of weight W, acted upon by a force P = 100N at an angle a = 30°, as shown, is resting on a horizontal surface. The coefficients of frictionbetween the block and the surface are μs, = 0.30 and μk = 0.25. The force exerted by the surface on the block is 440.5 N. a. What is P in component form?b. At the instant shown, what is the frictional force, f, between the block and the surface?c. What is the magnitude of the angle of friction?d. What is the resultant, Rfn, of the frictional force f and the normal force N?
Some insects can walk below a thin rod (such as a twig) by hanging from it. Suppose that such an insect has mass m and hangs from a horizontal rod with angle u = 40. Its six legs are all under the same tension, and the leg sections nearest the body are horizontal. (a) What is the ratio of the tension in each tibia (forepart of a leg) to the insect’s weight? (b) If the insect straightens out its legs somewhat, does the tension in each tibia increase, decrease, or stay the same?
A block of mass m= 19.5 kg rest on an inclined plane with the coefficient of static friction of us= 0.11 between the block and the plane. The incline plane is L= 6.3 m long and it has a high of h= 3.05 m at its tallest point. (A) what angle, theta in degrees, does the plane make with respect to the horizontal? (B) what is the magnitude of the normal force, fn in Newton’s, The ax on the block? (C) what is the component of the force of gravity along the plane, f gx in Newton’s?
a) What force (in N) must be exerted by the wind to support a 3.00 kg chicken in the position shown in the figure? (Assume r⊥ = 22.0 cmand r'⊥ = 8.00 cm.) b) What is the ratio of this force to the chicken's weight?
a) A 3.800 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is ?s=0.605 and the coefficient of kinetic friction is ?k=0.305.At time ?=0, a force ?=13.9N is applied horizontally to the block. State the force of friction applied to the block by the table at times ?=0 and ?>0. t=0 _______ t>0________ b) Consider the same situation, but this time the external force F is 28.0 N. Again, state the force of friction acting on the block at times ?=0 and ?>0. t=0_______ t>0_______
In the wheelbarrow, the load has a perpendicular lever arm of 7.50 cm, while the hands have a perpendicular lever arm of 1.02 m. (a) What upward force must you exert to support the wheelbarrow and its load if their combined mass is 45.0 kg? (b) What force does the wheelbarrow exert on the ground?
A 392-N force parallel to the plane is required to support a body on an inclined plane of height 300 m and base 400 m. If the force exerted by the plane on theb body is 780N, a. what is the weight of the body? b. what is the frictional force between the body and the plane?
a. If the plane was inclined at 37 degrees then the cart slides, what is the coefficient of static friction? b. If AB is 5 cm and AC is 20 cm, what is the coefficient of static friction?
the weight of a box is at 14 N Set the y-component of the applied force to -2 N. In that case, what is the magnitude of the normal force?_______ N (why is the answer 16.0N) n that case, what the maximum possible magnitude of the force of static friction? (Keep the y-component of the applied force at -2 N, the weight at 14 N, and then adjust the x-component of the applied force to find the maximum value of the force of static friction.)_______ N (why is the answer for this 8.0N)
(a) Find the normal force exerted on a 2.9-kgbook resting on a surface inclined at 36° above the horizontal.(b) If the angle of the incline is reduced, do you expect the normalforce to increase, decrease, or stay the same? Explain.
(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.
A man exerts a horizontal force of 121 N on a box with a mass of 34.7 kg. (a)If the box doesn't move, what's the magnitude of the static friction force (in N)? (b)What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)