You installed a new 40 gallon water heater with a 54,000 BTUh burner. The underground water temperature coming into the house is 55FHow long will it take to heat the water in the tank to a normal setting of 120F. Please show setup and calculations.

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2