R15-3. A 20-kg block is originally at rest on a horizontalsurface for which the coefficient of static friction is µ, = 0.6and the coefficient of kinetic friction is µ = 0.5. If ahorizontal force F is applied such that it varies with time asshown, determine the speed of the block in 10 s. Hint: Firstdetermine the time needed to overcome friction and startthe block moving.F (N)200(s)10

To find-: The speed of the block in 10s. Given-: The coefficient of static friction is μs=0.6. The…

Answered: R15-3. A 20-kg block is originally at…

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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The 2-kg spool S fits loosely on the inclined rod for which the coefficient of static friction is μ = 0.28. (a) If the spool is located 0.25 m from A, determine the maximum constant speed the spool can have so that it does not slip up the rod. Express your answer to three significant figures and include the appropriate units.
Block A has a mass of 55 kg, and block B has a mass of 11 kg. The coefficients of friction between all surfaces of contac are µs= 0.20 and Hk= 0.15. 25° If P= 0, determine the acceleration of block B. (You must provide an answer before moving on to the next part.) The acceleration of block B is m/s $ 25°.
A flat-bed truck weighing 7200 lb carries a 1500 lb box. As the truck starts from rest with a constant acceleration, the box slides 10 feet to the edge of the bed in the time that it takes the truck to acquire a velocity of 25 mph in a distance of 50 feet up the incline. Determine the coefficient of friction between the box and the truck bed. acx= 10.74 ft/s2 N = 1498 lb ay = 0 ft/s2. arx 13.44 ft/s2 f=575 lb 100 5 ac/x-2.697 ft/s2 Mk=0.384
Q14. As shown in the image below, the 20-kg box is pulled up the inclined plane with a constant velocity of 4.7 m/s. If the coefficient of kinetic friction between the box and the inclined plane is µ = 0.1, determine the power of force F. Please pay attention: the numbers may change since they are randomized. Your answer must include 1 place after the decimal point, and proper SI unit. Take g = 9.81 m/s². F Your Answer: Answer 30° units
Q21. The 10-lb block A attains a velocity of 7 ft/s in 5 seconds, starting from rest. Block Bhas a weight of 9 lb. Determine the coefficient of kinetic friction between block A and the horizontal plane. Neglect the weight and friction of the pulley. Please pay attention: the numbers may change since they are randomized. Your answer must include 3 places after the decimal point. Take g = 32.2 ft/s². A Your Answer: Answer B
Question: The 250-kg crate rests on the ground for which the coefficients of static and kinetic friction are μs = 0.5 and μk = 0.4, respectively. The winch delivers a horizontal towing force T to its cable at A which varies as shown in the graph. Originally the tension in the cable is zero Part A) Determine the speed of the crate when t = 3.9 s. Hint: First determine the force needed to begin moving the crate. Express your answer to three significant figures and include the appropriate units.

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