AST101H1 Quiz: Tests Topics and Info.pdf

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pearraccoon113

23 Apr 2012

School

UTSG

Department

Astronomy & Astrophysics

Course

AST101H1

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AST101H1 Full Course Notes

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Midterm #1: (tuesday may 31) location: tba; time: 6:10 6:55 pm: powerpoint notes astronomy as a science all, powerpoint notes light all, reading assignments from beginning up to and including section 5. 5. Distances using the p-l relation : reading assignments from section 15. 1 up to and including section 20. 2. Final exam: (tuesday june 28) location: tba: cumulative, all topics roughly equally weighted. Includes everything covered in the reading assignments, lectures and tutorials. Questions will be distributed throughout the entire class. You must participate in at least 75% of the questions to earn the grade. How does it count: participation mark, 0. 5% per class for any 10 classes. Date: may 31 (tuesday) and june 16 (thursday) Time: 6:10 6:55 pm (please go back to ms 2158 for lecture from 7:10 8pm) Format: 15 multiple-choice questions and 5 short answer questions (no choice) Bring: student id, pens (you may not write in pencil) and ruler.

Related Questions

(a) relative to galaxy 2 and

(b) relative to galaxy 5.

The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.

pinkswan477

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.

Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light-years (Mly), where a light-year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.

ceruleangiraffe295

Two thin hollow plastic spheres, about the size of a ping-pong ballwith masses (m1=m2 = 2e-3 kg) have been rubbed with wool. Sphere 1has a charge q1 = -3e-9 C and is at location < 20e-2, -20e-2, 0> m. Sphere 2 has a charge q2 = -3e-9 C and is at location <-30e-2, 20e-2, 0> m. It will be useful to draw a diagram of thesituation, including the relevant vectors.
What is the relative position vector pointing from q1 to q2?
= < , , > m
What is the distance between q1 and q2?
|| = m
What is the unit vector in the direction of ?
= < , , >
What is the magnitude of the gravitational force exerted on q2 byq1?
|grav on q2| = N
What is the gravitational force (vector) exerted on q2 by q1?
grav on q2 = < , , > N

What is the electric force (vector) exerted on q2 by q1?
electric on q2 = < , , > N

AST101H1 Quiz: Tests Topics and Info.pdf

AST101H1 Full Course Notes

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