What is the unit for thermal conductivity in SI units? (A) W/m-K (B) W/m² K (C)K/W.m² (D) W/K A 5 kg ball A rolls on smooth surface with a velocity 10 m/s collides with another ball B of mass 10 kg moving opposite to ball A with a velocity 4 m/s as shown in the following figure. The coefficient restitution is 0.6 between both the balls. Calculate the velocities of balls immediately after impact (v), = 10m/s A) 3.47 m/s and 493 m/s B) 25 m/s and 493 m/s B) c) 45 m/s and -6.5 m/s D) 3.47 ms and -6 m/s A B C D (A) = 4m/s The following welding defects are observed due to the uneven thermal expansion and contraction of different regions of the welded assembly. A-Distortion and warping of welding assembly B-Surface damage. C-Lamellar tears D-All the above A car uses a fuel at a rate of 22 L/h and produces 55 kW of power. Calculate the efficiency of the car engine. The fuel has the following properties: ==== heating value 44000 kJ/kg density = 0.3 g/cm³ A) 65.2% B) 52.6% C) 68.1% D) 26.5% In a hole-shaft assembly, the type of fit where the hole is larger than the shaft is: A) Clearance B) Transition C) Interference D) None of the above swer B