19. The term, The Mad as a Hatter, began in 19th century Europe because hatmakers used mercury.
Mercury vapor is toxic to Inhale and causes neurological damage. A 170-gram sample of
mercury requires how much heat to move from the liquid to gas phase? (Lvap = 2.95 x 10'J/kg]
a. - (170 ) (4.18 /gºC) (2.95 x 10's/kg)
b. Q - (170 g) + (2.95 x 10°J/kg)
c. Q - (0.17 kg) (2.95 x 10 /kg)
d. - (2.95 x 10" J/kg) + (0.17 kg)

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

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

Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?