Question 1 The wheels and axle system lying on a rough surface is shown in the figure. Each wheel has diameter 0.8 m and mass 1 kg. Assume that the mass of the wheel is concentrated at rim and neglect the mass of spokes. The diameter of axle is 0.2 m and its mass is 1.5 kg. Neglect the moment of Inertia of axle and assume g = 9.81 m/s. An effort of 10 N is applied on the axle in the horizontal direction shown at mid span of the axle. Assume that the wheels move on a horizontal surface without slip. The acceleration of the wheel the axle system in horizontal direction is m/s (round off to one decimal place). Engineering Mechanics (Dynamics) g 0.2 m 10 N. Wheel Axle 0.8m A rigid tank of volume 50 m contains a pure substance as a saturated liquid vapour mixture at 400 kPa. Of the total mass of the mixture, 20% mass is liquid and 80% mass is vapour. Properties at 400 kPa are : Saturation temperature, T=143.61C; Specific volume of Saturated liquid, v, = 0.001084 m/kg; Specific volume of saturated vapour, v = 0.46242 m/kg. The total mass of liquid vapour mixture in the tank is kg (round off to the nearest integer). the nearest Engineering Engineering Thermodynamics (Pure Substance) A shell and tube heat exchange is used as a steam condenser. Coolant water inters the tube at 300 K and at a rate of 100 kg/s. The overall heat transfer coefficient is 1500 W/mK and total heat transfer area is 400 m. Steam condenses at a saturation temperature of 350 K. Assume that the specific heat of coolant water is 4000 J/kgK. The temperature of the coolant water coming out of the condenser is (round off to the nearest integer). K Heat Transfer (Heat Exchanger) A machine of mass 100 kg is subjected to an external harmonic force with a frequency of 40 rad/s. The designer decides to mount the machine on an isolator to reduce the force transmitted to the foundation. The isolator can be considered as a combination of stiffness (K) and damper (damping factor, 5) in parallel. The designer has the following four isolators: 1. K=640 kN/m, = 0.70 2. K=640 kN/m, = 0.07 3. K=22.5kN/m, =0.70 4. K = 22.5kN/m, = 0.07 Arrange the isolators in the ascending order of the force transmitted to the foundation.