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Ideal Gases 12-27

bi77 — Sat, 18 Feb 2012 11:50:03 +0000

What is the average kinetic energy of a gas molecule at a temperature of 25 ?C ? Express it in joules and in electron volts. What is the corresponding rms velocity if the gas is

a) hydrogen,

b) oxygen,

c) nitrogen,

d) helium (monatomic), and

e) carbon dioxide? [Note that the first three molecules are diatomic.]

By Qvida CAM150RD/37

Force and Equilibrium 2-36

bi77 — Sun, 12 Feb 2012 05:20:46 +0000

In a stepladder as shown in Fig. 2.38 AC and CE are 2.4 m long and hinged at C. BD is a tie rod 0.72 m long, halfway up. A man weighing 768 N climbs up 1.8 m along the ladder. Assuming that the floor is frictionless and neglecting the weight of the ladder, find (a) the tension in the tie rod and (b) the forces exerted on the ladder by the floor. (Hint. It will help to isolate parts of the ladder in applying the equilibrium conditions.)

By Nautica N32505G

Graviiation 15-28

bi77 — Sun, 05 Feb 2012 03:12:18 +0000

The sun’s mass is about 320,000 times the earth’s mass. The sun is about 400 times as far from the earth as the moon is. What is the ratio of the magnitude of the pull of the sun onthe moon to that of the pull of the earth on the moon ? [For the purpose of the exercise, it may be assumed that the sun-moon distance is constant and equal to the sun-earth distance.]

by LG LuV400T

Continuun Mecganics 11-59

bi77 — Sat, 28 Jan 2012 07:15:19 +0000

On aday when the atmospheric pressure is 950 millibars,

a) What would be the hight of the mercury column in a barometric tube of inside diameter 2 mm ?

b) What would be the hight in the absence of any surface tension effects ?

c) What the minimum diameter a barometric tube may have in order that the correction for capillary depression shall be less than 0.1 mm of mercury ?

by 19508G NST

Systems of particles 8-29

bi77 — Wed, 04 Jan 2012 05:14:29 +0000

Three masses 5kg, 5kg, and 12kg are located at the corners of an equilateral triangle whose side are 4 m long. Find the center of mass from the 12kg mass.
Link:Mr.Depong

Vector Additional Problems 1-33

bi77 — Mon, 05 Dec 2011 05:44:09 +0000

A vector A of magnitude ten units and another vector B of magnitude six units point in direction differing by 60°. Fine (a) the scalar product of the two vectors and (b) the vector product of two vectors.

Vector Additional Problems 1-32

bi77 — Thu, 01 Dec 2011 11:23:35 +0000

Show that A * (B x C) is equal in magnitude to the volume of the parallelepiped formed on the three vectors A, B, and C.

Vector Additional Problems 1-31

bi77 — Tue, 29 Nov 2011 05:57:46 +0000

A person flies from Washington to Manila.

(a) Describe the displacement vector.

(b) What is its magnitude if the latitude and longtitude of the two cities are 39° N, 77° W, and 15° N, 121° E ?

Vector Additional Problems 1-30

bi77 — Sun, 27 Nov 2011 05:10:58 +0000

Two vector of length A and B make an angle of with each other when placed tail to tail. Prove, by taking components along two perpendicular axes, that the length of thair sum is

Vector Additional Problems 1-29

bi77 — Thu, 24 Nov 2011 06:28:27 +0000

A room has dimensions 10m x 12m x 14m. A fly starting at one corner ends up at a diametrically opposite corner.

(a) What is the magnitude of its displacement?

(b) Could the length of its path be less than this distance? Greater than thistance? Equal to this distance?

(d) If the fly walks rather flies, what is the length of the shortest path it can take?

By Fisher F75