Aswimming pool heater has to be able to raise the temperature of the 40 000 gallons of water in the pool by 10.0 c°.

how many kilowatt-hours of energy are required?

(one gallon of water has a mass of approximately 3.8 kg and the specific heat of water is 4 186 j/kg⋅°c.)
a. 1 960 kwh
b. 1 770 kwh
c. 330 kwh
d. 216 kwh

b. 1 770 kWh

Explanation:

The heat needed to change the temperature of a certain amount of a substance is given by:

Here m is the mass of the susbtance, C is the specific heat of the substance and is the temperature change

Recall that one watt hour is equivalent to 1 watt (1 W) of power sustained for 1 hour. One watt is equal to 1 J/s. So, one watt hour is equal to 3600 J and one kilowatt hour is equal to

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.