[填空题]
The current in an electromagnet connected :6 f tu) wy(qse;qy4;x*c5 pip/czxaadwvufd g73x9) to a 240-V line is 17.5 A. At what rate must cooling water pass over the coils if the water f)73d9xgvwdutemperature is to rise by no more than 7.50 $C^{\circ}\,$? kg/s