A1.2-kg rod that has a length of 1.0 m and a resistance of 5.0 o slides with constant speed down a pair of frictionless vertical conducting rails that are joined at the bottom. other than the rod, the rest of the circuit is resistanceless. a uniform magnetic field of magnitude 3.0 t is perpendicular to the plane formed by the rod and the rails as shown. determine the speed of the rod.
a)0.38 m/s
b)0.90 m/s
c)2.6 m/s
d)6.5 m/s
e) 8.7 m/s

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.