[填空题]
A “Carnot” refrigerator (the reverse of a Carnot e +mm-o*ij4e:v5q e sbmk6( uopngine) abs04aas- zka9,uyf u1 wvorbs heat from the freezer compartment at a temperature of -10ua-f az,91 akwuyv 4s7$^{\circ}\,C$ and exhausts it into the room at 25$^{\circ}\,C$.
(a) How much work must be done by the refrigerator to change 0.50 kg of water at 25$^{\circ}\,C$ into ice at -17$^{\circ}\,C$ $ \times10^{4 }J$
(b) If the compressor output is 210 W, what minimum time is needed to accomplish this? s
