Most people find waterbeds uncomfortable unless the water temperature is maintained

Most people find waterbeds uncomfortable unless the water temperature is maintained at about 85 °f. unless it is heated, a waterbed that contains 892 l of water cools from 85 °f to 72 °f in 24 hours. estimate the amount of electrical energy required over 24 hours, in kwh, to keep the bed from cooling. note that 1 kilowatt-hour (kwh) = 3.6 × 106 j, and assume that the density of water is 1.0 g/ml (independent of temperature). what other assumptions did you make? how did they affect your calculated result (i.e., were they likely to yield "positive" or "negative" errors)?