Molecular Physics | Thermodynamics Answers

Helium is contained in a 3 𝑚3 rigid volume at 60℃ and 100 kPa. Find the heat transfer needed to increase the pressure to 1000 kPa.

Helium is contained in a 3 𝑚3 rigid volume at 60℃ and 100 kPa. Find the heat transfer needed to increase the pressure to 1000 kPa.

There are developed 10hp by a Carnot engine between 1000F and 100F.

Determine;

a. The thermal efficiency

b. The heat supplied per seconds

c. The change in entropy each second during heat rejection

A Carnot power cycle operates on 2lb/min of air between the limits of 70F and 500

F. The pressure at the beginning of isothermal expansions is 400 psia and at the end

of isothermal expansion 185.psig, determine;

a. The volume at the end of the isothermal compression

b. ∆S during an isothermal process

c. Qa, Qr, Wnet

d. Thermal efficiency

e. The mean effective pressure.

How much work is necessary to compress air in an insulated cylinder from 0.20 to 0.01

m3

. Use T1= 20C and P1= 100Kpa

A group of 50 persons attended a secret meeting in a room 12m x 10m x 3m high. The

room is completely sealed off and insulated. Each person gives off 150 kcal/hr of heat

and occupies a volume of 0.2 cubic meters. The room has an initial pressure of 101.3

kpa and 16C. calculate the room temp after 10minutes.

A vessel of 58L capacity is well insulated and is divided equally by a rigid conducting

diaphragm. Initially both halves contain air at pressure of 137.8 Kpa and 413.4 Kpa

and temperature of 27C and 177C respectively. Find the increase of entropy of the

system

a) Find change in wavelength of 80-ppm x-rays that are scattered 120 degree by a target.

b)Find the angle between the directions of recoil electron and incident photon.

c) Find the energy of recoil electron.

A person weighs 837.72 newtons when she is on earth but only weigh 474.01 newtons when she is at the surface of another planet. What is the acceleration due to gravity on the planet?

Dry hydrogen is trapped by a pellet of mercury in a uniform capillary tube closed at one end. If the length of the

column of hydrogen at 270oC is 1.0m, at what temperature will the length be 1.20m?