The voltage and power ratings of a particular light bulb, which are its normal operating values, are 110 v and 60 w. assume the resistance of the filament of the bulb is constant and is independent of operating conditions. if the light bulb is operated at a reduced voltage and the power drawn by the bulb is 36 w, what is the operating voltage of the bulb?

You can decrease the resistance of a length of wire by

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?