3. Sera placed 200 g of dry ice in a bucket and left it near the window. She returned after 5 days to find nothing was left in the bucket. Assuming that all ice had melted and evaporated over the 5 days, determine how much energy was used by the ice to completely evaporate. Specific heat of water = 4200 Jkgloc-1 Latent heat of vaporisation of water = 2.3 × 10 Jkg Latent heat of fusion of ice = 340 000 Jkg -1 -1

The space within which a test north pole experiences a force magnetic poles 2. a powerful stream of electrons flowing high above the earth in the ionosphere electrojet 3. a concept to explain the directional nature of a magnetic field field lines 4. coil of wire designed to produce a magnetic field by a current passing through its windings ionosphere 5. that region above the earth's atmosphere where particles exist in an ionized state magnetic field 6. the extremities of a magnet where the field lines tend to converge or concentrate aurora borealis 7. a phenomenon that occurs in the northern latitudes; the northern lights solenoid