In an effort to stay awake for an all-night study session, a student makes a cup of

Question:

In an effort to stay awake for an all-night study session, a student makes a cup of coffee by first placing a 200-W electric immersion heater in 0.320 kg of water.
(a) How much heat must be added to the water to raise its temperature from 20.0°C to 80.0°C?
(b) How much time is required? Assume that all of the heater's power goes into heating the water