3.9.10.The centrifugal tension in belts(a) increases power transmitted(b) decreases power transmitted(c) have no effect on the power transmitted(d) increases power transmitted upto a certain speed and then decreasesWhen the belt is stationary, it is subjected to some tension, known as initial tension. The value of thistension is equal to the(a) tension in the tight side of the belt(b) tension in the slack side of the belt(c) sum of the tensions in the tight side and slack side of the belt(d) average tension of the tight side and slack side of the beltThe relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (d) is given by60°(a) p=d sin(c) p=d sin(120°Twhere T Number of teeth on the sprocket.90°(b) p=d sinT180°(d) p=d sinT

9. Correct Answer: (d) average tension of the tight side and slack side of the beltExplanation:The…

Answered: 3. 9. 10. The centrifugal tension in…

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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8 An inextensible massless string goes over a frictionless pulley. Two weights of 100 N and 200 N are attached to the two ends of the string. The weights are released from rest, and start 200 N moving due to gravity. The tension in the string (in N) 100 N is
4) This Atwood's machine includes two blocks connected by a cable, going over a pulley without slipping. Block 1 (30.0 kg) is connected to a spring (70.0 N/m), and slides on a horizontal surface with a coefficient of kinetic friction of 0.0100. Block 2 is 50.0 kg, and hangs vertically from the cable. The pulley is a disk with a radius of 0.500 m, and its moment of inertia about the center of mass is 10. 0 kg-m“. a) Draw the three free body diagrams, and write out Newton's 2nd Law for each. b) Derive the equation of motion (inhomogeneous 2nd order ODE) for this system. c) Use u-substitution to rewrite this as a homogeneous 2nd order ODE. d) Assume the position x as a function of time t is of the form x(t) = A cos (wt + p) I disk for undamped natural frequency w, phase angle P, and amplitude A. The initial conditions are: x(0) v(0) = -3. 00 m/s. Solve for the position of the mass as a function of time (you need to solve for w, 4, and A). = 2. 00 m and Mz
As speed as possible please
An electric motor drives a compressor by use of V-belt. The pulley diameter of the compressor shaft is 1.1 meter while the pulley diameter of the motor shaft is 0.6 meter. The belt speed runs at 27 m/s. The center distance between pulleys is 1.75 m. The groove angle of the pulleys is 35º. Determine the power generated in kW if the tension at the tight side of the belt is 670.5 N. The coefficient of friction between the belt and the pulley is 0.23.
A spring is used to stop a 32 kg metal sphere which is moving down a 30° incline, as shown in Figure Q2(a). The spring has a constant k = 33 kN/m and initially compressed 50 mm. Given that the velocity of the metal sphere is 5.5 m/s when it is 5 m from the spring and the friction can be neglected. (Gravity g = 9.81 m/s?) Q2. (a) Determine all the kinetic and potential energy components at the initial (i) and final position of the metal sphere. (Let the x be the additional compression of the spring). (ii) Calculate the maximum additional deformation of the spring requires to bring the metal sphere to rest. (iii) Determine after the metal sphere come into rest will it rebound upwards the slope or not? if can how much it will move up again the slope until it temporary at reset otherwise stated the reason why the metal sphere would stay at rest. 5.5m/s m=32kg 5m 30 Figure Q2(a)
Power is transmitted between two shafts by a V-belt whose mass is 0.9 kg/m length. The maximum permissible tension in the belt is limited to 2.2 kN. The angle of lap is 170° and the groove angle 45°. If the coefficient of friction between the belt and pulleys is 0.17, find : 1. velocity of the belt for maximum power ; and 2. power transmitted at this velocity. [Ans. 28.54 m/s ; 30.7 kW]
5. A valve operating in a vertical direction is opened by a cam and closed by a spring and when fully open the valve is in its lowest position. The mass of the valve is 4 kg and its travel is 125 mm and the constantf t frictional resistance to the motion of the valve is 10 N. The stiffness of the spring is 9.6 N/ mm and the initial compression when the valve is closed is 35 mm. Determine 1. the time taken to close the valve from its fully open position, and 2. the velocity of the vallve at the moment of impact. (Ans. 0.0161 s ; 14755 ms)
4. At the bottom of an incline at 45° to the horizontal, a 0.170 kg box is forced against a spring with constant 1500 N/m until the spring has been compressed by 0.11 m. How far does the box move up the incline before coming to rest if a) the incline is frictionless? b) there is a coefficient of kinetic friction of 0.3?
1. A pulley is driven by a flat belt running at a speed of 600 m/min. The coefficient of friction between the pulley and the belt is 0.3 and the angle of lap is 160°. If the maximum tension in the belt is 700 N ; find the power transmitted by a belt. Answer. 3.983 kW
2. Two blocks connected by a string passing over a pulley are on ramps inclined at 32 degrees and 25 degrees. The mass of block #1 is 1.8 kg and the mass of block #2 is 1.0 kg. Between block #1 and its ramp, the coefficients of static and kinetic friction are 0.15 and 0.10, respectively. There is no friction between block #2 and its ramp. The system is released from rest and the blocks move. The pulley is massless and frictionless, so you can ignore the pulley. b. C. d. 32° 25° Draw a free body diagram (FBD) for each block. Include all of the forces acting on the two blocks. Apply Newton's Second Law to each block to obtain an equation for the forces acting on each block in the x-direction and an equation for the forces acting on each block in the y-direction. Consider the information provided about this system. When the blocks are released from rest, what direction will the blocks move? Explain why? Calculate the acceleration of the blocks. I
A spring of negligible mass is compressed between two masses on a frictionless table with identical sloping ramps at each end. The masses are released simultaneously. The masses have the same volume, but the density of M1 is greater than that of M2. M1 M2 wW (Select Greater than, Less than, or Equal to.). Greater than v The final height up the ramp reached by M1 is ... the height reached by M2. Equal to on M1. v The (magnitude of the) force exerted by the spring on M2 is ...the force it exerts v The duration of the force exerted by the spring on M1 is the time the force acts Equal to on M2. ...
6. A 12 lb. weight stretches a spring 2 feet. The mass-spring system is immersed in a medium offering resistance that is numerically equal to one quarter of the instantaneous velocity. The weight is released from a point 1 foot below equilibrium. Find its position at any future time.

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