3. A 100 N force acts as shown on a 50 kg box sliding on an inclined plane. The force exerted by the surface on the block is 474.79 N. The coefficients of friction between the box and the plane are p, = 0.3 and Pe = 0.25. 50 kg P = 100 N 30° Which of the following is closest to the magnitude and direction of frictional force by the incline on the box? 4. Which of the fiollowing is closest to the value of the angle of friction? 14.04 5. Which of the following is closest to the magnitude of the resultant of the normal force and the frictional force? 499 N O

3. A 100 N force acts as shown on a 50 kg box sliding on an inclined plane. The force exerted by the surface on the block is 474.79 N. The coefficients of friction between the box and the plane are p, = 0.3 and Pe = 0.25. 50 kg P = 100 N 30° Which of the following is closest to the magnitude and direction of frictional force by the incline on the box? 4. Which of the fiollowing is closest to the value of the angle of friction? 14.04 5. Which of the following is closest to the magnitude of the resultant of the normal force and the frictional force? 499 N O

Name: The answer for the 2nd question is 14.04 degrees and the answer for th
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Description: The answer for the 2nd question is 14.04 degrees and the answer for the third question is 489 N. Please show the solutions on how to get these answers. Also, please help me in solving the first question. 3. A 100 N force acts as shown on a 50 kg box

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter5: Further Applications Of Newton's Laws: Friction, Drag, And Elasticity

Section: Chapter Questions

Problem 3PE: (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) 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) 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 ten 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 pain.
Suppose you have a 120-kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.
A person doing a chin-up weighs 700 N, exclusive of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 355 N on the torso. If the upward movement starts from rest, what is the persons velocity at that point?
8. A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley may be considered frictionless. The coeffi- cient of static friction between the block and the plane is us; and the coefficient of kinetic friction is k 0 A. g D. g - Hk sin(0) m a. What is the magnitude of the static frictional force acting on the block? B.m g [1 - sin(0)] C. mg D. mg cos(0) B. g - Hk cos(0) A. m g sin(0) E. mg [1 - cos(0)] b. If the rope were cut between the block and the pulley, what would be the magnitude of the acceleration of the block down the plane? C. g [sin(0) - μ cos(0)] sin(0)] c. If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane? B. g [2 tan(0) - uk sin(0)] D. 2g [μ sin(0) - cos(0)] m E. g [tan (0) A. g [2 - μk sin(0)] C. g [2 cos(0) - μ sin(0)] E. g [2 sin(0) Hk Cos (0)]. -
moodle.nct.eduom/mod/qi -Learning Portal Courses - Reports - e-Services- Academic Departments - ETC - CIMS - A 17kg crate resting on a horizontal surface is pushed as shown. If the coefficient of static friction u, between the surfaces is 0.24, what is the minimum force (F) required to start the motion? O a 4.08N O b. 70.83N Oc 39.98N Od. 694.17N Windows buut An object of mass Skg is sliding with a constant velocity of 10m/s on a frcitionless horizontal table. The force needed to keep the object moving with the same velocity is. 144 4- # 4. 6. V.
1. A 15.0 kg box is being pulled along level ground by a 75.0 N force that is directed at an angle of 20o above the horizontal. The coefficient of kinetic friction is 0.330. What is the acceleration of the box? 2. A 5.00 kg box is being pulled at constant speed up a 30o incline by a force of 45.0 N parallel to the incline. Determine the coefficient of kinetic friction between the box and the plane
8. A 152 kg box is pulled by a person with 258 N force at angle of 15.0° across a level floor at a constant speed. What is the coefficient of a kinetic friction between the box and the floor?
3. A block of mass m = 5.9 kg is pulled up a 0 = 21° incline as in the figure below with a force of magnitude F = 37 N. (Hint: remember to measure all angles from +x axis.) y a. Draw a free body diagram showing all the forces. NORml Fte F Mass = 5.9k 0-21° F-37N there b. Determine the x and y components of all the forces. X Components of Force f = 37 N Y comporents of Force F=0N X componnt of normal force=ON * Componis of weight=-5.9x 9.8x Sin 210=70. FJN Y Comperents of weight=5.9a 9.8 x Casal. - 53.98 Y Compenents of normal force=mglos H%53.98, c. Write equations summing all the x components and all the y components. F-mg Sm@= mxa 37-20.72= 5.9x a 2.7l6 = Comporunts) Normal force - mg les 0: 05 53.98-53.98-0o d. Find the acceleration of the block if the incline is frictionless. (Give the magnitude of the acceleration. Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.12. (Give the magnitude of the acceleration.) е. 3
A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. A. What is the friction force on the box if a horizontal 140-N push is applied to it? If it moves, what is its acceleration? B. What is the friction force on the box if a horizontal 175-N push is applied to it? If it moves, what is its acceleration?
. A 1 000-N crate is being pushed across a level floor at a constant speed by a force of 300 N at an angle of 20.0° below the horizontal, as shown in (a), a. What is the coefficient of kinetic friction between the crate and the floor? b. If the 300-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in (b), what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in a.
2. A man pushes a crate of mass 70kg along a horizontal floor with a constant horizontal force in an easterly direction. Starting from rest, the trunk. reaches a velocity of 1.5 m/s (E) after 3.0s. The coefficiant of Kinetic friction between the crate and the floor is 0.34. Determine the man's horizontal applied force. Be sure to draw a free body diagram fram and indicate positive direction.