Calculate the increase in heat-dissipation rate which could be obtained from a cylinder wall by using four pin-shaped fins (fins are insulated at the ends) per square inch each having a diameter of 3/16 in. and a heigh ofn. assume that the heat transfer coefficient between the surface of the cylinder wall or a fin and the surrounding air is 25 btu/hr-ftf, the cylinder wall is at 600 °f, and the a 70 °f. the wall and the fins are made of aluminum

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

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

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.