求解答幾條physics問題!!!?

1. Calculate the energy needed to raise the temperature of some meat from 5°c to 40°c ( The heat capacity of the meat is2100J°C-'

2.A 1500-W heater is immersed in 3 kg of water. The temperature of the water rises from 20°C to 80°C. The specific heat capacity of water is 4200J kg-' °C-'
（a）Find the energy transferred to the water.

（b）Assume that there is no energy loss .Find the heating time.