# Chp2-3-4 - SCCC 115 Homework 3 - Due 22 Sept. 2005 Prof....

This preview shows pages 1–4. Sign up to view the full content.

SCCC 115 Homework 3 - Due 22 Sept. 2005 Prof. Christina Lacey P: 2-10, 3-5, 3-6, 3-11, 3-12, 4-4 R & D: 4-4 P 2-10: The Sun moves in a roughly circular orbit around the center of the Milky Way Galaxy, at a distance of 26,000 ly. The orbital speed is roughly 220 km.s. Calculate the Sun's orbital period and centripetal acceleration. Calculate the Mass of the Galaxy. Recognize that the distance from the Sun to the center of the Galaxy is the same as the radius. Remember that velocity=distance/time. In the case of the Sun's orbit, the period is the time it takes th Sun to complete one full revolution about the center of the Galaxy. In this case the distance traveled is the circumference of the orbit and time is the period. (1)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Now I can use either Kepler's 3rd Law or Newton's formulation to find the total mass of the Galaxy. I will use Kepler's 3rd Law here, remember to convert R to AU and use P in years. In this case : Newton's method: (2) Kepler's Method: (3) Centripetal acceleration of the Sun: (4) P 3-5: What is the wavelength of a wave with a frequency of 3.2 GHz?
m is a radio wave. P 3-6:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 11/01/2009 for the course PHYS 229 taught by Professor Mehmetyali during the Fall '09 term at Sabancı University.

### Page1 / 6

Chp2-3-4 - SCCC 115 Homework 3 - Due 22 Sept. 2005 Prof....

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online