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.

The necleus of an atom is made up of what subatomic particles?

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction