Question 5Figure 5 shows a brake having one shoe with an applied force, F. Five seconds after the force isapplied, the drum comes to a stop. During this time the drum makes 100 revolutions. Use the short-shoe approximation and an estimated coefficient of friction of 0.35.(a) Determine the magnitude of all forces including support reactions on the free body diagram.(b) How far above the drum centre would the arm pivot need be to make the brake de-energizing?Justify your answer.(c) How much work does the brake do in bringing the drum to a stop?600 mm500 mmFshoeR110 mmdrumFigure 5VariableValueUnitF1,200Nww 06

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Answered: Question 5 Figure 5 shows a brake…

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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Problem 4. A.) If the uniform concrete block has a mass of 500 kg, determine the smallest horizontal force P needed to movethe wedge to the left. The coefficient of static friction between the wedge and the concrete and the wedge and the floor is 0.3. The coefficient of static friction between the concrete and floor is 0.5.ANSWER: P=1797.52; N=1.80kNB.)Refer to problem number 4. Calculate the followinga.) the angle of friction between the wedge and the concrete and the wedge and the floor.Answer: ?????? ??? ????????= ?????? ??? ?????= 16.7ob.) the coefficient of static friction between the concrete and floor.Answer: ????????? ??? ?????= 263.56o
Question 4 If the coefficient of friction between surfaces is 0.47, calculate the smallest force P required to keep the block from falling down .
Question-6 What is the value of P in the system shown in Fig to cause the motion to impend?Assume the pulley is smooth and coefficient of friction between the other contact surfaces is 0.2.Figure:5
Determine diameter of hand-wheel or length of handle, assuming that maximum force exerted by a man is 150 lbf. The bolt is 1" OD, 0.9" ID. Coefficient of friction is .15 You need to push down with a force of 6000lbf. This is for a handle of a screw press. Please explain the equation and I will upvote
8. Answer the following questions about the exercise of Box A (massmA=50kg) and Box B (mB=10kg) located on the slope as shown in Figure 7. Between slope and box A, the coefficient of static friction is uk, and the angle of slope is 10 degrees, although box A and B are connected in a solid line and ignore the mass of the pulley.1)What is the maximum friction (kgf) between Box A and Slope for us=0.4 and Uk=0.15?2)What is the maximum friction between Box A and the slope (kgf) for us=0.3 and UK=0.15?3)us=0.3 and Uk=0.15 What is the tension in kgf?4)us=0.3 and uk=0.15 when box B goes down 2m, calculate the size (m/s) of the speed of box A and box B using the modified energy supply law.
A ladder is leaning against a vertical wall, and both ends of the ladder are at the point of slipping. The coefficient of friction between the ladder and the horizontal surface is ?1=0.245 and the coefficient of friction between the ladder and the wall is ?1=0.253 . Determine the maximum angle α with the vertical that the ladder can make without falling on the ground.
A block whose weight is 40 N rests on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50. A string is attached to the block. The string is pulled horizontally with a force of 15 N. Which one of the following statements is correct? The magnitude of the force of friction on the block is 5 N. The magnitude of the force of friction on the block is 15 N. The force of friction cannot be determined because the coefficient of kinetic friction is not given. The magnitude of the force of friction on the block is 20 N. The force of friction cannot be determined because the normal force of the surface on the block is not known. 2. A block is sliding at constant speed down a ramp. Decide whether each of the following statements is true or false. (a) The net work done on the block as it slides equals zero. True or False (b) The normal force does zero work on the block as it slides. True or False (c) The friction force does positive…
One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle ? with the stick. The coefficient of static friction between the end of the meter stick and the wall is us =0.40. B. A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance x from the wall. Assume that angle ? = 15° in this problem. What is the minimum value of x for which the stick will remain in equilibrium? C. When angle ? = 15°, how large must the coefficient of static friction be so that the block can be attached 0.10 m from the left end of the stick without causing it to slip?
The uniform block shown in Fig. P-1077 weighs 200 lb. It is pulled up the 300 lb. Determine the maximum and minimum values of d so that the block does not tip over as it slides up the incline. The coefficient of friction is 0.20.
How much horsepower is delivered by a block brake having a drum 120 mm in diameter and a 400 mm brake arm length. The pivot point is 40 mm below the point of tangency and 80mm horizontally between the drum and the shoe. The applied load for clockwise rotation is 24,767N when the drum rotates at 300 rpm. Assume a coefficient of friction of 0.25.
A pulley with a diameter of 4 in. can rotate about a fixed shaft with a diameter of 2 in. The coefficient of static friction between the pulley and shaft is 0.20. Determine; a. the smallest vertical force P required to start raising a 500-lb load. b. thesmallest vertical force P required to hold the load. c. the smallest horizontal force P required to start raising the same load.
Two blocks A and B shown in (Figure 1) have a weight of 9 lb and 6 lb , respectively. They are resting on the incline for which the coefficients of static friction are μA = 0.13 and μB = 0.23. Determine the angle θ which will cause motion of one of the blocks. What is the friction force under each of the blocks when this occurs? The spring has a stiffness of k = 2 lb/ft and is originally unstretched. Part A Determine the smallest angle θ which will cause motion of one of the blocks. Express your answer in degrees to three significant figures. Part B Determine is the friction force under the block A at this angle. Express your answer to three significant figures and include the appropriate units. Part C Determine is the friction force under the block B at this angle. Express your answer to three significant figures and include the appropriate units.

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