A plane furnace surface at 50 to the power of o C covered with 1-cm-thick insulation is exposed to air at 30 to the power of o C , and the combined heat transfer coefficient is 25 space W divided by m squared. to the power of o C . The thermal conductivity of insulation is 25 space W divided by m to the power of o C . The rate of heat loss from the surface per unit surface area is

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature