Molecular Physics | Thermodynamics Answers

Evaluate and compare the work and heat transfer when 0.8kg of air, at a pressure of 2.6 Bar and a temperature of C degree, expand in a closed thermodynamic system to three times its initial volume : (1) according to ti Boyles law and, (2) according to Charles law. The characteristic gas constant for air is 200 J kg -1 K-1 and its specific heat capacity at constant volume is 700Jkg -1 K-1

Saturated steam at 10 bar is cooled at constant pressure until its dryness fraction becomes 50%. The change in temperature of steam in ◦C is ______

Determine the specific heat capacities at constant volume and constant pressure for methane, given that its molecular weight is 16 and the adiabatic index of expansion and compression is 2.3 the universal gas is 8314 j Kmol-1/K-1

Explain why a hot humid day is far more uncomfortable than a hot dry day at the same temperature?

equivalent fluid density of 40 pcf for the
soil density of 150 pcf
concrete density of 150 pct

In the retaining wall what is the resisting moment Mrm =
lbs. the over-turning moment Motm =
factor ratio, S. F. =

1. The foot of a ladder rests against a wall and its top is held by a tie rope as shown in the figure below. The ladder weighs 100N, and center of gravity is 0.40m length from the foot. A 150N Child hangs from a rung that is 0.20 of length from the top. Determine the tension in the tie rope and the components of the force on the foot of the ladder.

4. A boy stands at the centre of a turn table with his two arms stretched. The turn table is set rotating with an angular with an angular speed of 40 r.p.m. How much is the angular speed of the boy if he folds his hands back and thereby reduces his moment of inertia to 2/5times the initial? Assume the turn table to rotate without friction.

1. A golfer takes three putts to get the ball into the hole. The first put displaces the ball 3.66m north, the second 1.83m southeast, and the third 0.99m southwest. What are
I. Magnitude, and
II. The direction of the displacement needed to get the ball into the hole on the first putt.

What fraction of applied heat is converted to work on the surroundings by air expanding isobarically against a piston.

Helium is expensive so when it boils off the superconducting magnet in magnetic resonance
imaging (MRI) scanners, it is collected and recycled. As a part of the recycling process, the
monatomic He gas is first isothermally compressed by a factor of 4, then isochorically cooled to
140 K. Suppose we start with 40.0 L of the gas in the collecting bag at room temperature (300 K)
and atmospheric pressure.
The number of moles of the gas is closest to :
A. 0.8
B. 1.6
C. 2.4
D. 3.2
E. 4.0