(1)V=V 2-V 1=456.178m 3- 456.163m 3= 0.015m 3
m=ρV = 0.6kg/m 3×0.15 m 3= 0.009 kg
(2)Q =cm△t = 4.2×10 3J/(kg·℃)× 0.009kg ×(100℃-15℃)=3.57×10 5J
(3)∵电能转化为内能的效率是90%
∴Q=O.9W = O.9Pt
(1)V=V 2-V 1=456.178m 3- 456.163m 3= 0.015m 3
m=ρV = 0.6kg/m 3×0.15 m 3= 0.009 kg
(2)Q =cm△t = 4.2×10 3J/(kg·℃)× 0.009kg ×(100℃-15℃)=3.57×10 5J
(3)∵电能转化为内能的效率是90%
∴Q=O.9W = O.9Pt