Molecular Physics | Thermodynamics Answers

A 32.4 L sealed cylinder contains 120. moles of helium gas at 44.8 atm. What iis its temperature (in Celsius)?

Data Analysis. Using Archimedes' principle of buoyancy, analyze and complete the following data obtained in an experiment. (2 points each)
WEIGHT OF METAL ON AIR: 1.47 N
LIQUID APPARENT LOSS OF VOLUME OF DENSITY BUOYANT WEIGHT WEIGHT LIQUID FORCE (N) (N) DISPLACED (N)
(m3)
OF THE LIQUID (kg/m3)
Water
1.32 N
(25)
(26)
1 000 kg/m3
(27)
Olive Oil
(28)
0.138 N 1.53 x 10-6 m2 920 kg/m3
(29)
DENSITY OF THE METAL: (30)

A steel railroad track has a length of 40 m when the temperature is -3◦C. What is the increase in the length of the rail on a hot day when the temperature is 31◦C? The linear expansion coefficient of steel is 11 × 10−6 (◦C)−1.Answer in units of m. 2.)Suppose the ends of the rail are rigidly clamped at -3◦C to prevent expansion. Calculate the thermal stress in the rail if its temperature is raised to 31◦C. Young’s modulus for steel is 20 × 1010 N/m2.Answer in units of N/m2.

An automobile tire having a temperature of 7.1◦C (a cold tire on a cold day) is filled to a gauge pressure of 26 lb/in2. What would be the gauge pressure in the tire when its temperature rises to 38◦C? For simplicity, assume that the volume of the tire remains constant, that the air does not leak out and that the atmospheric pressure remains constant at 14.7 lb/in2.Answer in units of lb/in2

The temperature of 350 g of water changed from 20oC to 30 oC. How much heat did this sample
absorb? Cp for water = 4.18 J/goC

Nicholas Mason inflated a weather balloon using just the power of his lungs. The balloon’s final radius was 1.22 m. If 642 kJ of work was done to inflate the balloon, at what net pressure was the balloon inflated?

A system with just two energy levels in thermal equilibrium with a heat reservior at temp. 600°k .The energy gap between the level is 0.1 eV. Find the probability that the system is in higher energy level.

A 1.0kg sample of steam is cooled from 110 degree celsius to 40 degree celsius. How much energy must be withdrawn for this to occur?

Two metallic spheres P and Q made of same material have same smoothness but the weight of P is 8 times that of Q. If the two are heated to same temperature and left to cool then the ratio of rate of cooling of Q to that of P is
ans 2:1

During a non-flow process 120 Btu of heat is removed from each lbm of the working substance while the internal energy of the working substance decreases by 85.5 Btu/lbm. Determine how much work is involved in the process and indicate whether the work is done on or done by the working substance.