You leave 255 grams of water outside at 21.0 C in the sun. After 30.0 minutes the temperature is 35.0 C.
A) how many calories of energy was used by the sun to heat the water up?
B) how many joules of energy is this?
C) How many Joules / second of power did the sun provide? (Hint: how many seconds are in 30.0 minutes?)
A.
q = mass H2O x specific heat H2O x (Tfinal-Tinitial)
B.
1 cal = 4.184 J
C.
Can you take C from here.