Aluminum rivets used in airplane construction are made slightly larger than the rivet holes and cooled by "dry ice" (solid co2) before being driven.
if the diameter of a hole is 4.500 mm, what should be the diameter of a rivet at 23.0 *c, if its diameter is to equal that of the hole when the rivet is cooled to - 78.0 *c, the temperature of dry ice? assume that the expansion coefficient of aluminum is 2.4

If two metal balls each have a charge of -10^-6 c and the repulsive force between them is 1 n, how far apart are they? (coulomb's constant is k = 9.0x 10^9 n-m^2/c^2? 9.5 m 9.0 mm 9.5 cm 0.9 m .

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)