6.A leather belt 125 mm wide and 6 mm thick, transmits power from a pulley 750 mm diameter whichruns at 500 r.p.m. The angle of lap is 150° and μ = 0.3. If the mass of 1 m³ of leather is 1 Mg and thestress in the belt is not to exceed 2.75 MPa, find the maximum power that can be transmitted.[Ans. 19 kW]

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Answered: 6. A leather belt 125 mm wide and 6 mm…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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6. A leather belt, 125 mm wide and 6 mm thick, transmits power from a pulley 750 mm diameter which runs at 500 r.p.m. The angle of lap is 150° and u = 0.3. If the mass of 1 m' of leather is 1 Mg and the stress in the belt is not to exceed 2.75 MN/m?, find the maximum power that can be transmitted. [Ans. 18.97 kW]
Two 400 mm diameter pulleys are keyed to a simply supported shaft 500 mm apart. Each pulley is 100 mm from its support and has horizontal belts, tension ratio being 2.5. If the shear stress is to be limited to 80 MPa while transmitting 45 kW at 900 r.p.m., find the shaft diameter if it is to be used for the input-output belts being on the same or opposite sides. [Ans. 40 mm]
A solid shaft 15 meters long is stressed to 85 MPa when twisted through 6 degrees. If G = 83 GPa. What power in kW can be transmitted at 1000 rpm?
a string is attached to a mechanical vibrator, which has a frequency of 30Hx. the sttring is 3.0m long and has a linear density of .4 g/cm. the tension is varied by adding weights to teh string passing over the pully. What tension is needed to cause the string to resonate with the vibrator in four segments. assume that he points where the string meets the vibrator and the pulley are approx nodes.
Given: rA= 2.75 in, rB = 4.50 in, • Gear A: Wa= 1.1 lb, ka = 1.55 in, • Gear B: Wb= 4.4 lb, kb = 3.50 in . Moment applied to gear A= 31 lb-in change all units into feet from the start! use g = 32.2 ft/s^2 Find: B The magnitude of the force between gears A and B Fab= lb Written work, show angular accelerations of each gear Your Answer:
Pipe Pa Fluid Rigid rock Figure 1: A pipe embedded in rigid rock. Consider an isotropic linear elastic pipe of inner radius a and outer radius b embedded in rigid (i.e., non-deforming) material and holding a fluid at pressure Pa. Ignore the effects of gravity. This may be a good model for a PVC pipe embedded in rock or concrete. Assume the problem is symmetric and that strains out of the plane shown in Fig. 1are zero. (a) What state of strain exists in the pipe, plane strain or plane stress? (b) Determine the stress components, orr and σ00, and displacements, ur, in the pipe. (c) Is the stress difference orr - 000| greatest at r=a or r = b? Note: the location of the greatest stress difference is where plasticity will occur first (to be covered later in class).
122 1.17 The tripod shown in Fig. 1.73 is used for mounting an electronic instrument that finds the distance between two points in space. The legs of the tripod are located symmetrically about the mid-vertical axis, each leg making an angle a with the vertical. If each leg has a length / and axial stiffness k, find the equivalent spring stiffness of the tripod in the verti- cal direction. CHAPTER 1 FUNDAMENTALS OF VIBRATION FIGURE 1.73 A tripod carrying an electronic instrument.
It's a mechanics of material
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3
A transverse traveling wave on a taut wire has an amplitude of 0.200 mm and a frequency of 500 Hz. It travels with a speed of 196 m/s. (a) Write an equation in SI units of the form y=A sin (kx - vt) for this wave.(b) The mass per unit length of this wire is 4.10 g/m. find the tension in the wire.
Suppose you use an audio pulley of the top shown in figure 5.18 (c) to support a car engine of mass 110 kg. (a) what would the tension in the rope be?n ? (b) what force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 8.00 KG. n? (Upward)

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