+ Frictional Forces on Flat BeltsWhen engineers design belt drives and band brakes,they engineer them to withstand the frictional forcesthat develop between the belts or bands and theircontacting surfaces. These frictional forces lead totensions on each side of the contacting surfaces thatare unequal; the segment aligning with the motion ofthe belt or band has a greater tension.FigureB0.500 m0.200 m-0.400 m-A3 of 30.300 mPart Cmc=Block A has a mass of mA = 49.0 kg and rests on a flat surface. (Figure 3)The coefficient of static frictionbetween the block and the surface is A = 0.300. The coefficient of static friction between the rope and thefixed peg B is 0.320. The width of the block is d = 0.250 m. Find the greatest mass, mc, that weight C canhave such that block A does not move.Express your answer numerically in kilograms to three significant figures.▸ View Available Hint(s)SubmitDrouide FoodbookVAZO I vec?1 of 3kg>Review

GivenmA=49kgμA=0.300μB=0.320d=0.250m

When engineers design belt drives and band brakes, they engineer them to withstand the frictional forces that develop between the belts or bands and their contacting surfaces. These frictional forces lead to tensions on each side of the contacting surfaces that are unequal; the segment aligning with the motion of the belt or band has a greater tension. Figure B -d- <3 of 3 > ▾ Part C Block A has a mass of mA = 45 between the block and the surfa fixed peg B is 0.320. The width have such that block A does no Express your answer numeri View Available Hint(s)

When engineers design belt drives and band brakes, they engineer them to withstand the frictional forces that develop between the belts or bands and their contacting surfaces. These frictional forces lead to tensions on each side of the contacting surfaces that are unequal; the segment aligning with the motion of the belt or band has a greater tension. Figure B -d- <3 of 3 > ▾ Part C Block A has a mass of mA = 45 between the block and the surfa fixed peg B is 0.320. The width have such that block A does no Express your answer numeri View Available Hint(s)

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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Q2/A belt drive consist of two V– belts in parallel, on grooved pulleys of the same size. The angle of the groove is 30°. The cross – section area of each belt is 750 mm? and u is 0.12. The density of the belt material is 1.2 Mg/m³ and the maximum safe stress in the material is 7 MN/m?. Answer the following questions 1- The centrifugal tension in belts is (a) increases power transmitted (b) decreases power transmitted (c) have no effect on power transmitted (d) increases power transmitted up to a certain speed and then decreases
Q2 / A belt drive consist of two V-belts in parallei, on grooved pulleys of the same size. The angle of the groove is 30". The cross - section area of each belt is 750 mm? and u is 0.12. The density of the belt material is 1.2 Mg/m' and the maximum safe stress in the material is 7 MN/m. Answer the following questions 1- The centrifugal tension in belts is . . (a) increases power transmitted (b) decreases power transmitted (e) have no effect on power transmitted (d) increases power transmitted up to a certain speed and then decreases
estion 3 A flat belt drive connects two pulleys 5 meters apart. The 2m pulley diameter driver rotates at 350rpm, and the driven pulley has a diameter of 1.5m. The thickness and the mass of the belt drive is 5mm and 0.6kg respectively. The coefficient of friction between the belt and the pulley is 0.25. The belt experience 3% of slip during power transmission with a maximum tension of 1200N. Calculate the speed and torque of the driven shaft.
The 60° V-belt of a machine is pass around the pulley A of a motor and over a pulley B as shown in Figure Q2 (b). The motor exerts a torque of 7 Nm to drive the system. The coefficient of static friction for both pulley is 0.35 and both pulleys has an equivalent diameter. Calculate the tension of T, and T, of V-belt just before it start rotating. M B Ø= 120 mm Ø- 120 mm
Q1/ An open belt drive connected two pulleys 120 cm and 50 cm diameter on parallel shafts 4 m apart. The belt weights 0.9 kg/m length and maximum tension in it is not to exceed 2000 N. 0.3. The 120 cm pulley, which is the driver, runs at 200 rpm. Due to belt slip on one of the pulleys, the velocity of the driven shaft is only 450 rpm. Calculate the torque on each of the two shafts and power transmitted.
Clutch Mechanism 8. In the clutch mechanism shown, two flat circular disks of radius R are mounted so that they can be brought into contact causing a net frictional force. The contact pressure in general depends on the distance from the center and in one specific case may be modeled buy P(r) = Poe-kr, where k is a constant and r is the distance from the center of the discs. The integral cR F = 2m " P(r)rdr gives the total contact force between the discs. Cross-section a. In your own words explain where this formula comes from.
A conical friction clutch is used to transmit 70 kW at 1000 rpm. The semicone angle is 20° and the coefficient of friction is 0.2. If the outer diameter is 400 mm and the inner diameter is 340 mm and the intensity of normal pressure is not to exceed 0.20 N/mm². Determine the axial Force (F) required in Newton (N)
(Q2) A pump is driven by an electric motor using an open type flat belt. Determine the width and length of belt for the following data: Power transmission = 15kW Rotational speed of the motor=1,440 rpm Motor pulley diameter = 250 mm Pump pulley diameter = 500 mm Coefficient of friction for motor pulley = 0.26 Coefficient of friction for pump pulley 0.22 Center distance between the pulleys = 1,200 mm Thickness of the belt = 5 mm Density of belt material = 1,000 kg/m? Allowable stress for the belt material = 2 MPa
Q2 A flat belt type is used for a belt drive system connecting two pulleys 1.2m apart. The driver pulley with diameter 40 cm is rotating with the speed 350 rpm, while diameter of driven pulley is 100 cm. Coefficient of friction of the contact surface between belt and pulley is 0.3. Maximum allowable tension is 600N. (i) Find the power transmitted by the belt, P. (ii) Determine the Initial tension of the belt, TA. (iii) If the flat belt is now replaced by a Vee-belt with groove angle of B = 30°, find the power transmitted by this belt. Give explanation why power transmitted by flat and Vee-belt type are not the same. Explain your answer according to basic friction concept.
(b) The 60° V-belt of a machine is pass around the pulley A of a motor and over a pulley B as shown in Figure Q2 (b). The motor exerts a torque of 7 Nm to drive the system. The coefficient of static friction for both pulley is 0.35 and both pulleys has an equivalent diameter. Calculate the tension of T, and T, of V-belt just before it start rotating. M A B 120 mm 120 mm Figure Q2 (b)
In a belt arrangement two pulleys are connected by flat belts having same diameters. Themaximum force on the tight side of belt is 662 N. If co-efficient of friction is 0.3 thenwhat is maximum force on the slack side of the belts?
5 The forces F, and F, in a brake band and the direction of rotation of the drum are as shown in the figure. The coefficient of friction is 0.25. The angle of wrap is 3Tt/2 radians. It is given that R = 1 m and F, = 1 N. The torque (in Nm) %3D %3D exerted on the drum is F2 F,