A part of a mobile suspended from the ceiling of an airport terminal building consists of two metal spheres, the first sphere has a mass of 2.0 kg, and the second one is 3.0 Kg. They are connected by a uniform metal rod with a mass of 3.6 kg and a length of 4.0 m. The assembly is suspended at its midpoint by a wire and rotates in a horizontal plane, making 7.0 rpm. Find: A. The angular momentum of the system, B. The kinetic energy of the assembly, 2.0 kg 4.0 m C. Calculate the power consumption in 3 hours working. 7.0 rpm 3.6 kg 3.0 kg

TWO CONCRETE BLOCKS WEIGHING 1800 N EACH FORM PART OF THE RETAINING WALL OF A SWIMMING POOL. WILL THE BLOCKS BE IN EQUILIBRIUM WHEN THE POOL IS FILLED, AND THE POOL EXERTS THE LINE LOADING SHOWN? IF YES, WILL IT SLIDE OR TIP? ALSO, DETERMINE THE HEIGHT OF WATER IN WHICH THE POOL WILL BE FILLED SUCH THAT THE BLOCKS WILL BE IN EQILIBRIUM. 300 mm 540 mm A-0.5 540 Plastic liner mm A-10 6Nmm

3.36 The torques shown are exerted on pulleys B, C, and D. Knowing that the entire shaft is made of aluminum (G = 27 GPa), deter- mine the angle of twist between (a) C and B, (b) D and B. 30 mm 0.6 m A 0.8 m 400 Nm B 30 mm 1m 900 N-m 36 mm 0.5 m 36 mm 500 Nm CN

Two blocks of rubber, each 80mm long by 40mm wide by 20mm thick are bonded to a rigid support mount and to a movable plate (1). When a force of P-2800N is applied to the assembly, the rubber block above plate (1) deflects 8mm horizontally. Calculate the shear modulus G of the rubber for the blocks. Remember shear modulus is similar to Young's modulus in Hooke's law. (you come up with the formula) 8 mm 20 mm 40 mm 20 mm 80 mm

Homework 7 Two pipes of same thickness and cross section area are subjected to the same twisting moment which one is stiffer? M Mt R b b

estion 5 of 10 A Answers: or what value M of the clockwise couple will the horizontal component Ax of the pin reaction at A be zero? If a couple of hat same magnitude M were applied in a counterclockwise direction, what would be the value of Ax? M= i Pux 3.0 Y I L--x * B M 1.8' 56 lb-ft lb 1.8' MC 0/10 E 27°C T-s

21:19 40 A 9 41%- Chegg Home Expert Q&A My answers ( Civil Engineering Question The rope ABexerts a 46 - N force T on the collar at A Let rCA be the position vector from point Cto point A (Figure 1) Figure You answered Bo P1 II

Two vertical rods AB (A36 steel, E = 200 GPA) and CD (red brass, E = 101 GPA) support a rigid bar AC which is loaded at E. In the current configuration workers in the factory have noticed the horizontal bar AC rotates slightly once the load in E is applied. This is causing problems and needs to be addressed. Your supervisor has asked you to first verify that this rotation is occurring and calculate its magnitude. Then determine the new location for the load application point E such that this rotation can be eliminated.

Q2. Calcualte the magnitude of the couple moment acting on the steel bar shown in the diagram below. 100 N X 1m 2 m Z 2.5 m 2m 100 N y

4) While trying to change a tire, the driver shown below applies a force, P, of 25 Ibs at each end of the lug wrench. The lug wrench is made of solid steel with a circular cross-section of 0.5" and has a shear a) Use statics to calculate the amount of torque at point A of the wrench in Ib-in. Remember that the force is applied on both sides. [Ans. to Check: 450 lb-in] modulus of 11,400 ksi. c) The allowable shear stress in the wrench is 25 ksi. Determine the Factor of Safety (FOS) against yield. b) Calculate the maximum shear stress that the driver would apply to the lug nut at A (in ksi). [Ans. to check: 18.3ksi] d) Find the angle of twist in radians at the same location. Assume the wrench is symmetrical and that it is 9" from the center of the wrench to point A. 9.0 in. 9.0 in. A d = 0.5 in. P = 25 lb