7. If the specific latent heat ofice is 340 000 J/kg and the specific latent heat of steam is
2 300 000 J/kg, calculate
a) the energy needed to melt 2 kg ofice at 04
b) the energy needed to melt 500 g of ice al
0 °C
c) the energy needed to boil 3 kg of water a
100 °C
d) the energy needed to boil 100 g of water a
100 °C.

Research and discuss the aurora borealis in terms of electric charges, magnetic fields, and forces. which times of the year are best for seeing the northern lights, and where are the best places to view them? explain your answers. also identify links to good images. if you’ve ever seen the aurora borealis, describe your experience and note the time and place that you saw it.