To increase the rate of heat transfer from a device, which has 0.1 m² of exposed surface, you added 500 pin fins of 4 cm length and 2 mm diameter on top of the device's exposed surface. How much (i.e., by what factor) did the rate of total heat transfer rate (from the surface) increase? Assume that the convection coefficient is 42 W/m².K, and the thermal conductivity of the fin material is 240 W/m-K. Neglect radiation. 2.06

Can someone help me fill out this worksheet please? I have A-R except G filled out so far. Thank you

A lawnmower stops running after a short period of time. The fuel tank filler cap is removed and an almost fuel tank of fuel is found, so the cap is reinstalled and the engine restarted. The engine runs again for a short time and then dies so the cap is removed again and the process repeats. Tech a says the problem may be due to a clogged vent in the fuel cap. The b says that the intake mainfold gasket may be defective. Who is correct?