1. one item lose heat and 2 items gain heat. Change in temp = (150 -@) and (@-20).
Final steady temp @ = 25.8 degrees celsius.
2. One time lose heat and one item gain heat. Change in temp = (@-20) and (20-10)
@ = 1270 degree Celsius.
3. Energy = P x time . Energy = mLv . Time = 904s
4. Two items gain heat and one item lose heat. Change in temp = (@-20) and (70-@).
@= 57.6 degree celsius.
5. Energy = power x time. Two items gain hear. The kettle and water. Change in temp = (90 -10)
6. Thermal 3 question
7. Energy = N(KE) x time , where N is number of electrons per second. All the KE is converted to heat when electron collide with metal target. Equating Energy to Heat . Change in temp = (80 - 18). time = 1.44 x0*5 s .
8. Two items gain heat and two items lose heat. Change in temp = (48-25) and (100-48), mass = 6.11 g
9. Two items gain heat and two items lose heat. Change in temp = (30-0) and (100-30) , m =0.390 kg .
10. Increase in GPE does not mean increase in internal energy. The microscopic ke remains constant.
11. The shaking increase the ke of the molecules hence temperature increase.
