Aptitude Test Problems in Physics Science for Everyone by S Krotov ( PDFDrive.com )

2. Heat and Molecular Physics

For the problems of this chapter, the universal

gas constant R (wherever required) should be

taken equal to 8.3 J/(mol•

2.1. Two vertical communicating cylinders

of different diameters contain a gas at a

constant temperature under pistons of mass

mi = 1 kg and m^2 = 2 kg. The cylinders

are in vacuum, and the pistons are at the

same height /to = 0.2 m.

What will be the difference h in their

heights if the mass of the first piston is

made as large as the mass of the second

piston?

2.2. The temperature of the walls of a ves-

sel containing a gas at a temperature T is

Twall•

In which case is the pressure exerted by

the gas on the vessel walls higher: when the

vessel walls are colder than the gas

(Twan < T) or when they are warmer than

the gas (Twall > T)?

2.8. A cyclic process (cycle) 1 - 2 - 3 - 4 - 1

consisting of two isobars 2 - 3 and 4 - 1, iso-

chor 1-2, and a certain process 3 - 4 represent-

ed by a straight line on the p-V diagram

(Fig. 57) involves n moles of an ideal gas.

The gas temperatures in states 1, 2, and