Hurricane flintstone has knocked out the power to your home. you need to power the two appliances you connected in problem 1. your neighbor has a bonda generator and they have graciously extended a 50 foot extension cord to your home that has a resistance of 0.0075ω per foot of wire. (how many "wires" in an extension cord? ) by how much is the delivered power reduced? (you will have to calculate the "resistive load" of the above appliances! )

from the previous problem, one appliance consumed 1100 watts and the other consumed 900 watts. they were connected in the previous problem to a 120v outlet

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?