Physics questions for Barrack

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Physics

Homework #1

1- Classify the following systems as open or close or isolated:

· A mass of gas in a container with rigid. Impermeable, diathermal walls.

· A mass of gas in a container with rigid , impermeable , adiabatic walls.

· A sugar solution enclosed by a membrane permeable only to water that is immersed in large container of water.

·

2 ) On a plot of volume versus temperature. Draw and label lines indicating the following processes , each proceeding from the same initial state Vo. To

A) An isothermal expansion.

B) An isothermal compression.

C) An isochoric increase in temperature.

3) Estimate the pressure you exert when standing on the floor. Express your answer in atmospheres, in pascals and in torr. Repeat the calculation for spiked heels.

4) At what temperature do the Fahrenheit and kelvin scales give the same reading?

5) Estimate the pressure your car exerts on the road. How is this related to the pressure in your car’s (non-run flat!) tires?

6) Use Avagadro’s and Loschmidt’s numbers to estimate the number of molecules in a cubic micron. (See section 1.4 in text.)

7) Carter problem 2.2

A tank of volume 0.5 m^3 contains oxygen at a pressure of 1.5 *10^6 Pa and a temperature of 20 degree C . Assume that oxygen behaves like an ideal gas:

a) How many kilo moles of oxygen are in the tank?

b) How many kilograms?

c) Find the pressure if the temperature is increased to 500 degree C?

d) At a temperature of 20 degree C , how many kilo moles can be withdrawn from the tank before the pressure falls to 10 percent of original pressure?

8) Carter problem 2.3,

A cylinder provided with a movable piston contain an ideal gas at a pressure P 1, specific volume v1 and temperature T1 . The pressure and volume are simultaneously increased so that at every instant P and v are related by the equation.

P= Av , A = constant

a) Express A in term of the pressure P1, the temperature T1 and the gas constant R.

b) Make a sketch representing the process in the P- V plane .

C) except changed so that in part c find the final temperature if T1 = 250 K.

9) Let . Compute

a.

b.

c.

10) (Ideal gas)

a. Show that the slope of an isotherm is given by

b. Show that the slope of an isochore is given by

as of 4:56 PM on 2/5/15