13–71. The 150-lb man lies against the cushion for whichthe coefficient of static friction is µ, = 0.5. Determine theresultant normal and frictional forces the cushion exerts onhim if, it due to rotation about the z axis, he has a constantspeed v = 20 ft/s. Neglect the size of the man. Take 0 = 60°.*13-72. The 150-lb man lies against the cushion for whichthe coefficient of static friction is My = 0.5. If he rotatesabout the z axis with a constant speed v = 30 ft/s,determine the smallest angle 0 of the cushion at which hewill begin to slip off.8 ft

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Answered: 13–71. The 150-lb man lies against the…

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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30° -2 pies-- 1.5 pies + 1.5 pies 1.5 pies + 1.5 pies Each box in the stack of four boxes weighs 3 lb. The stack is transported on the dolly weighing 38 lb. Determine the maximum force F that the woman exerts on the steering crank shown so that neither box will tip over or slip. The coefficient of static friction at all contact points is us = 0.5. Dolly wheels roll freely. Ignore your mass.
The automobile has a weight of 3300 lb and is traveling forward at 4 ft/s when it crashes into the wall. The impact occurs in 0.06 s. The figure shows a car crashing into a wall. If the coefficient of kinetic friction between the wheels and the pavement is μk = 0.3, calculate the impulsive force on the wall if the brakes were applied during the crash. The brakes are applied to all four wheels so that all the wheels slip
1) Determine the average braking torque to be applied to stop the vehicle of mass 1.5 ton is movingdown the hill at a slope of 1:7 at 60 kmph and the vehicle is to be stopped at a distance of 50 m.Take the diameter of the vehicle tyre as 500 mm. If the friction energy is momentarily stored in a20 kg cast iron brake drum, what is the average temperature rise of the drum? The specific heat forcast iron may be taken as 520 J/kg ˚C.
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2. The car has a mass of 1.6 Mg and center of mass at G. If the coefficient of static friction between the shoulder of the road and the tires is µs = 0.4, determine the greatest slope the shoulder can have without causing the car to slip or tip over if the car travels along the shoulder at constant velocity. 2.5 ft 5 ft 4 ll
Show complete solution. Draw FBD
The 44-kg disk is rotating at w = 130 rad/s. When the force P is applied to the brake as indicated by the graph. The coefficient of kinetic friction at B is µk = 0.5. Neglect the thickness of the brake. (Eigure 1) Figure 1 of 1 P (N) 500 1 (3) 300 mm 300 mm 150 mm 200 mm
The spring-mounted 0.82-kg collar A oscillates along the horizontal rod, which is rotating at the constant angular rate À = 9.1 rad/s. At a certain instant, r is increasing at the rate of 850 mm/s. If the coefficient of kinetic friction between the collar and the rod is 0.56, calculate the friction force F exerted by the rod on the collar at this instant. Vertical 0 Answer: F= i Attempts: 0 of 3 used Submit Answer eTextbook and Media Save for Later N
The man pushes on the roller with force P through a handle that connects to the central axle of the roller. If the coefficient of static friction between the 43-lb roller and the floor is ls = 0.12, and the force Pis maximum so that the roller is about to slip, determine the angular acceleration of the roller (in rad/s²). Assume the roller to be a uniform cylinder. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper unit. Take g = 32.2 ft/s2. 1.5 ft 30° Your Answer: Answer
Q6/ The uniform box shown has a mass of 100 kg. Determine the friction force (F) and the status of the box (at rest or motion). The coefficient of static friction is us = 0.80. * P = 700 N 100 kg 30° 300 N H = 0.80
The fork lift has a weight of 2,400 lb and a center of gravity at G. If the rear wheels are powered, whereas the front wheels are free to roll, determine the maximum number of 300-lb crates the fork lift can push forward. The coefficient of static friction between the wheels and the ground is μw = 0.4 and between the each crate and the ground μc = 0.35. 2.5 ft 1.25 ft -3.50 ft- XIXIX

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