A rod 38 cm long moves in a plane perpendicular to a magnetic field of 0.049 T. The velocity of the rod is perpendicular to its length. Find the speed of the rod if the potential difference between the ends is 9.7 V.

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.