Molecular Physics | Thermodynamics Answers

a 40 m x 20 m swimming pool is filled with water t a depth of 2.8m, determine the heat in kj required to raise the temperature of the water in the pool from 12degree C to 29 degree C

a fluid has mass of 8kg and occupies a volume of 1.5m^3 the pressure of 101.3 kpa. if the specific internal energy is 1800 kj per kg, determine the total enthalpy in mj

a fluid with a vapor 0.4 pascal and the specific gravity of 14 is used in a barometer. the fluids column height is 0.8m.find the atmospheric pressure in kpa

The resistivity of an

intrinsic semiconductor sample at 280 K was measured to be

15

Ω·cm. At 3

20 K, it was 0.6

Ω·cm. Assuming that the mobilities of both electrons and holes

decrease with temperature as

μ

e

,

h

~ 1/

T

3/2

, find the bandgap of this material.

The variation of Cv Cp and k = Cp/Cv, with pressure and temperature are being studied for superheated steam. Let the pressure range be 15-100 psia and the temperature range be 250-900°F. See §§ 2.18, 2.19 for discussion of the specific heats. Write a computer program that will produce the respective values throughout the p and t ranges described. Assume that the steam table data are stored in the memory of the computer.

Assume 2 kg of hydrogen (Item B 28) are initially at 40 atm, 100 K. (a) If the hydrogen changes pressure to 1 atm without a change of temperature, find the changes of enthalpy and entropy. (b) If the hydrogen changes temperature to 35 K with no change of entropy, find the change of pressure and enthalpy.

A football is kicked vertically upward from the ground and a student gazing out of a window sees it coming passed him at 16ft/sec. The window is 30ft above the ground.

a. How high does the ball go above the ground?

b. How long does it take to go from a height of 30ft to the highest point?

(a) Find a conversion factor to convert from miles per hour to kilometers per hour.

(a) Find a conversion factor to convert from miles per hour to kilometers per hour. (b) In

the past, a federal law mandated that highway speed limits would be 55 mi/h. Use the

conversion factor of part (a) to find this speed in kilometers per hour. (c) The maximum

highway speed is now 65 mi/h in some places. In kilometers per hour, how much increase

is this over the 55 mi/h limit?

1.      The velocity of a train changes from 0 to 60 in 20 seconds. Assuming that it is uniformly accelerated, what is the acceleration in m/s squared?