Three bars, each 2 ft long and weighing 9.66 lb, are pinned together to form the equilateral frame shown in Fig. P-1245. They rotate in a horizontal plane about a vertical axis at A. What torque is required to cause an angular acceleration of 12 rad per sec? What is the reaction at A when the frame reaches a speed of 38.2 rpm?

Three bars, each 2 ft long and weighing 9.66 lb, are pinned together to form the equilateral frame shown in Fig. P-1245. They rotate in a horizontal plane about a vertical axis at A. What torque is required to cause an angular acceleration of 12 rad per sec? What is the reaction at A when the frame reaches a speed of 38.2 rpm?

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter11: Columns

Section: Chapter Questions

Problem 11.2.4P: Repeat Problem 11.2-3 assuming that R= 10 kN · m/rad and L = 2 m.

See similar textbooks

Similar questions

Q.no-2 During test on a sample of steel bar 25 mm in diameter, it is found that the pull of 50kN produces an extension of 0.095 mm o a length of 200 mm and a torque 200N-m producesan angular twist of 0.9 degrees on a length of 250mm. Find the Poisson ratio of the steel.
(78 E A O o 1.:ra Your answer Q1 * Find tension in AC and W ? 60 3° 10 lbs W=20 Ibs , TAC=17.32 Ibs W=18.95 Ibs , TAC=21.91 Ibs W=18 Ibs , TAC=20.1 lbs Find the reaction in pin A?
! Required information 44 mm GGGGG 54 mm T₁ The magnitude of the internal reactions for (a) shaft AB is (b) shaft BC is (c) shaft CD is (kN.m) (kN.m) (kN.m) Te 46 mm Tp Under normal operating conditions, the electric motor exerts a torque of 2.4 kN-m on shaft AB. Assuming that TB=1.2 (kN.m), Tc-0.9 (kN.m) and TD-2.1 (kN.m), determine the maximum shearing stress in (a) shaft AB (b) shaft BC and (c) shaft CD 40 mm
Repeat Problem 11.2-3 assuming that R= 10 kN · m/rad and L = 2 m.
- A flat spiral steel spring is to give a maximum torque of 1500 N-mm for a maximum stress of 1000 MPa. • Find the thickness and length of the spring to give three complete turns of motion, when the stress . decreases from 1000 to zero. The width of the spring strip is 12 mm. The Young's modulus for the material of the strip is 200 kN/mm2.
(8) An axle (non-rotating) is to be machined from AISI 1144, OQT 1,000°F, to the proportions keyway в shown, with a fillet radius r = 0.2D; F varies 1.SD from 400 lb. to 1,200 lb.; the supports are to the left of B, not shown. Let N = 2 (Soderberg Line). 6" (a) At the fillet, compute D and the 30 maximum tensile stress. (b) Compute D at section B. (c) Specify suitable dimensions. Keeping the given proportions, would a smaller diameter be permissible if the fillet were shot-peened?
Ex: The second shaft on a parallel-shaft 25-hp foundry crane speed reducer contains a helical gear with a pitch diameter of S.08 in. Helical gears transmit components of force in the tangential, radial, and axial directions. The components of the gear force transmitted to the second shaft are shown in Fig. (8) at point A. The bearing reactions at C and D, assuming simple- supports, are also shown. A ball bearing is to be selected for location C to accept the thrust, and a cylindrical roller bearing is to be utilized at location D. The life goal of the speed reducer is 10 kh, with a reliability factor for the ensemble of all four bearings (both shafts) to equal 1 (90% reliability) with light to moderate impact. (a) Select the roller bearing for location D. (b) Select the ball bearing (angular contact) for location C, assuming the inner ring rotates. *- 20 Fig (8)
Plz give proper Answer other wise don't attempt. A shaft of 30 kW 710 r.p.m motor is 40 mm in diameter and is supported in bearings 500 mm apart. Calculate, (a) Stress due to bending if the armature weighing 10,000 N concentrated at the centre acting vertically.
also find ax and ay The rod is supported by smooth journal bearings at A.B. and C and is subjected to the two forces Fi= 400 N and F 520 N (Egure 1) Figure 0.6m 0.6m 0.6m 0.4m 1 of 1 Part A Determine the 2 and y components of reaction at Cusing scalar notation Express your answers in newtons to three significant figures separated by a comma View Available Hint(s) [95] ΑΣΦ. 11 | vec C.C. Submit Part B ? B. B N Determine the az and a components of reaction at B using scalar notation Express your answers in newtons to three significant figures separated by a comma View Available Hint(s) ΑΣΦ | 19 | voc) N
thick lnange be! The total torque required to turn the double threaded power screw is 55 N.m. If the screw turns at 285 rpm and the pitch of 4mm, find: A. The horsepower input of the power screw. B. The efficiency if the weight loaded is 10 kN.
Ex: The second shaft on a parallel-shaft 25-hp foundry crane speed reducer contains a helical gear with a pitch diameter of 8.08 in. Helical gears transmit components of force in the tangential, radial, and axial directions. The components of the gear force transmitted to the second shaft are shown in Fig. (8) at point A. The bearing reactions at C and D, assuming simple- supports, are also shown. A ball bearing is to be selected for location C to 262 accept the thrust, and a cylindrical roller bearing is to be utilized at location D. The life goal of the speed reducer is 10 kh, with a reliability factor for the ensemble of all four bearings (both shafts) to equal1 (90% reliability) with light to moderate impact. (a) Select the roller bearing for location D. (b) Select the ball bearing (angular contact) for location C, assuming the inner ring rotates. 356.6 144 297.5 3 in 2915 4.04 in 106.6 595 144 250 Fig.(8) Table(1) Bearing Characteristics That May Influence the Selection of Bearing…
A torsional bar is subjected to two external torques (10NM and 5Nm) and a distributed torque (15NM/m) at the locations indicated in the picture. The angle of twist at A (z = 0) is 0. The shcar modulus is 2GP.. Compute the following quantitics: (a) the reaction moment at A, (b) the angle of twist at B, and (c) the angle of twist at C. OD=5cm OD=4cm 15Nm/m 10Nm 5 Nm A 15 cm 10cm 8 cm 15 cm F A 8cm B C