LESSON 9

PHYS 1100 LESSON 9 FOR
THURSDAY, AUGUST 19, 2010

I Introduction

II Logistics – Running Grades

III Turn in Assignments Due: Homework Sets 1, 2, 3. Essays 1, 2, 3, etc. and Return of Papers

IV Test 3

V Mind Game 3

VI Review of Lesson 8: Inertia, Torque, Gravity
A. Inertia is kg m2.
B. Torque is N-m
C. Gravity:

1. Kepler – P2 (m + M) = [(4 p2)/G] r3.

This is Kepler’s 3rd law dealing with the period of a planet, P, with a mass, m, traveling around the Sun, with a mass, M, at a distance between the Sun and the planet equaling “r”. However, it applies to moons, asteroids, stars, satellites, blah blah.

Period is in seconds, mass in kilograms, distance in meters (mks). The Universal Gravitational Constant is G = 6.67 x 10-11 N m2 / kg2.

2. Newton – F = GmM/r2.

This part of Newton’s 2nd Law, which deals with the force, F, of gravity.

Little ‘m’ is the mass of a smaller object, such as human; big “M” is the mass of the larger object, such as planet Earth; r is the distance between the center of the first object (like a human’s navel) and the center of the second object (like the distance from the human to Earth’s core, i.e., the radius of Earth.

As a force, instead of a period, this law applies both to moving objects, like planets, moons, stars; and to object that are not moving, like people standing on Earth, or between two bowling balls in a bowling alley.

The Universal Gravitational Constant is G = 6.67 x 10-11 N m2 / kg2.

VII Lesson 9: Waves and Fluids
A. Waves
1. Length
2. Frequency
3. Period
4. Amplitude
5. Speed
6. Types
7. Other

B. Fluid Dynamics
1. Definition of “fluid”
2. And, defn of “dynamics”
3. Density
4. Pressure
5. Bernoulli’s Law
6. Archimede’s Principle
7. And more….

VIII Laboratory Exercise 9: Kepler’s Laws


IX HWK Assignment 4: Read Chapters 15-16 and do Problems 1, 3, 9, 13, 19, 25, 29, 31, 39, 53, 63, 65, and 67 on pp 530-534 and do Problems 1, 3, 9, 13, 19, 25, 29, 31, 39, 53, 63, 65, and 67 on pp 566-569; Due 8/26

X Essay 4: Albert Einstein, due 8/26