Molecular Physics | Thermodynamics Answers

The expansion tank of a house hold hot water heating system is open to the

atmosphere and is 10 m above a pressure gage attached to the furnace. What is

the gauge pressure at the furnace, in pascals? In atmosphere?

500.g of brass (c=.0920 cal/g°C) at 200.°C and 300.g of steel (c=.115 cal/g°C) at 150.°C are added to 900.g of water (c=1 cal/g°C) in a 150.g Aluminum pan (c=.220 cal/g°C), both of which are at 20.0°C. Find the common equilibrium temperature.

An ambulance driving 20.0 m/s emits a sound wave with a frequency of 500 Hz. As it drives away from a hospital, which of the following is the only possible frequency heard by the medical staff who are standing at the entrance? 

In the interval 0°C to 660°C plantinum resistance thermometer is used for interpolating temperature on internation scale. If the variation of resistance with temperature is given by R1=R°[1+at+bt2],find the value of a,b given R°=10π,R100=13.948π and R444.6=24.817π

how much heat is given out when 50g of steam at 100°C cool to water at 28°C?

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