Molecular Physics | Thermodynamics Answers

A rigid tank of volume 24 liters contains 0.2 kg of H2O originally at 2 bar. Find 

specific volume and initial temperature. What are the phases present (solid, 

liquid, vapor?). The tank was heated until its pressure reached 20 bar. Find work 

and heat exchanged during this process as well as final temperature

An insulated water heater operating at steady state has two inlets and one 

outlet. At inlet 1, liquid water enters at 7 bar, 42oC, and a mass flow rate of 70 

kg/s. At inlet 2, wet vapor at 7 bar with a quality of 98% is injected. At outlet, 

saturated liquid at 7 bar exits the water heater. Ignoring heat transfer with the 

surroundings and neglecting kinetic and potential energy effects, determine 

the mass flow rate, in kg/s, at inlet 2

Steam is stored in a 0.3m3

rigid tank, initially at 7bar and 440oC. After a long 

time, steam temperature was measured and found to be 240oC. Find the final 

pressure as well as work and heat exchanged during that time.

In a mixer enters two streams: CO2 at a rate of 2kg/s and 35oC as well as N2 at 

a rate of 3 kg/s and 50oC. During mixing, 100kW of heat is added while all inlet 

and outlet streams are at 4 bar. Obtain outlet mixture temperature, partial 

pressures of each gas.

Nitrogen is throttled at a rate of 0.9 kg/s from a pressure of 10 bar to 1.5 bar. 

Outlet diameter is 10 cm. If outlet temperature was 37oC, calculate velocity at 

outlet and deduce temperature at inlet. Find work and heat exchanged per 

second during this process.

.Air at 1 bar, 27oC and a rate of 0.4 kg/s enters a 10 cm diameter duct where it 

is heated at constant pressure to reach 727oC at exit. Calculate outlet velocity 

and deduce heat and work exchanged per second.

Given : Vector A = "No. of letters of your First Name" units @ N 75° E Vector B = "No. of letters of your Last Name" units @ N 25° E Vector C = "No. of letters of your Middle Name" N @ 45° east of south Find the and direction of the resultant vector

Heat is added to 200 kg of ice at 0 ºC until dry steam at 100 ºC is obtained.

The specific heat capacity of water is 4200 J kg^‑1 K^‑1, the specific latent heat of steam is 2260 kJ kg^-1 and the specific latent heat of ice is 335 kJ kg^-1.

Determine the total amount of heat energy (in MJ) added to the ice.

a. 452MJ

b. 520MJ

c. 603MJ

d. 84MJ

A machine gun fires 50gm bullets at a speed of 1000m/s. The gunner, holding the machine gun in his hands, can exert an average force of 180N against the gun. Determine the maximum number of bullets he can fire per minute

determine the velocity of steam flowing in a circular pipe with a diameter of 4 inches and volume flow rate of 4 liters per second.