Molecular Physics | Thermodynamics Answers

How much heat is needed to turn the 1 kg of ice at -4°C to turn it into vapor at 100°C?

Two litres of hydrogen at a pressure of 10^5 Pa expands adiabatically to 1.5 times the initial volume. Find the work done?

I kg of a fluid expands reversibly according to a linear law from 4.2 bar to 1.4 bar; the initia] and final volumes are 0.004 m) and 0.02 m). The fluid is then cooled reversibly at constant pressure, and finally compressed reversibly according to a law po = constant back to the initial conditions of 4.2 bar and 0.004 m '. Calculate the work done in each process and the net work of the cycle. Sketch the cycle on a. p-v diagram,

A centrifugal compressor which represents an open system takes in air at a pressure of 2 bar and a temperature of 28 c at the rate of 1.4 m/s. compression takes place according to the law PV
^1.3 =C and the delivery pressure is 3.5 bar Determine (i) the input power and (ii) the heat transfer rate.

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?

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.