1. If the specific latent heat of ice 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 of ice at 0 °C
b) the energy needed to melt 500 g of ice at
0°C
c) the energy needed to boil 3 kg of water at
100 °C
d) the energy needed to boil 100 g of water at
100 °C.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c