QI: A box weighing 100 N is at rest on a horizontal floor. The coefficient of the static friction between the box and the floor is 0.4. What is the smallest force exerted eastward and upward at an angle of 30° with the horizontal that can start the box in motion?

QI: A box weighing 100 N is at rest on a horizontal floor. The coefficient of the static friction between the box and the floor is 0.4. What is the smallest force exerted eastward and upward at an angle of 30° with the horizontal that can start the box in motion?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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DD=25
A rope is hung over a stationary drum with weights on each end (100N; 400N). The rope is just on the point of slipping. What is the coefficient of friction, and wrapped number. And also, if we take the same rope and making 14 turns around a stationary horizontal drum to support a heavy weight. If the coefficient of friction is Almost the same, what weight can be supported by exerting a 50-lb force at the other end of the rope?
A crate of 69 kg simply stands on the moving cart with constant acceleration a. The height from the center of gravity to the cart, L, is 1.4 m, and the angle = 13°. What is the maximum acceleration a (in m/s²) the cart can have without sliding on the cart? The coefficient of static friction between the crate and the cart is μl g = 0.51. Please pay attention: the numbers may change since they are randomized. Your answer must include 3 places after the decimal point. Take g = 9.81 m/s². 0.5 m 0.5 m L Your Answer: Answer G
1. A 20 kg block is resting on a 40 degree incline. If the coefficient of static and kinetic friction are O. 20 and O. 15 respectively, what minimum force inclined 50 degrees from the horizontal is required to prevent movement? Without said preventive force, what is the velocity of the block after 5 seconds?
A body whose mass is 12 kg rests on a plane inclined 30 ° with the horizontal. What force parallel to the incline must be applied so that it moves down with a = 1.25 m/s2? Coefficient of static and kinetic friction are 0.55 and 0.35, respectively. Specify whether the force is up or down the incline.
A ladder of length 5 m is resting against a smooth wall, its point of contact being just below a first floor window. The bottom of the ladder rests on the ground and the coefficient of friction between the ladder and the ground is 0.3. A person of mass 75 kg climbs the ladder, which has a mass of 4 kg. The bottom of the ladder is at the point of slipping, outward from the wall, just as the person reaches the mid-point of the ladder’s length. Draw a free body diagram of the ladder and calculate the maximum frictional force opposing the slipping motion. In addition, determine the angle of inclination (θ) of the ladder, when the person is at the mid-point and the ladder is on the verge of slipping.
In the situation shown in image, let u be the angle of the slope and suppose there is friction between the cart and the track. You find that if the cart and bucket each have the same weight w, they remain at rest when released. In this case, what is the magnitude of the friction force on the cart? Is it less than, greater than, or equal to w?
A carnival ride has people stand inside a vertical cylinder with their backs to the wall. The cylinder starts spinning and the riders find that they are “stuck” to the wall and don’t slide down, even if the floor is removed. The ride has a radius of r. The person has a mass of m and is moving with a constant speed of v. The coefficient of static friction between the person and the wall is μs , and kinetic friction μk. The person is only touching the wall, not touching the floor. What is the magnitude of the acceleration of the person? In what direction does it point? The speed is constant. Why is the acceleration not zero? Briefly explain. No equations!
Subject: Statics of Rigid Bodies
Please Provide reason/expression for understanding.
PROBLEM 1: Referring to figure below, (a) draw the free body diagram of the system (SO1.1), (b) set-up the equations (or the force triangle) required in solving the problem (SO1.5), and (c) determine force P to make the block stay at rest. (SO1.3).(friction is ignored) P. 500 lb. 45° 300
Solve it correctly please. I will rate accordingly.