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Flashcards in Astronomy up to First Test! Deck (93)
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positive curvature

curved like a sphere, surface meets itself

1

negative curvature

surface is curved so that it does not touch itself
curved down on top, and upside down U on sidesw

2

angstrom

10^-10m

3

1 light year

10^16m

4

space dimensions

x, y, z, time
length of space called L

5

mass

scalar value, resistance to acceleration

7

electric charge

unit q. can be either + or -, related to electrical field. opposites attract

8

angles

theta and phi, theta is main angle phi is other. 365 degrees

9

Units of Arc

365° in a circle, 1°=60 minutes ('), 1 minute = 60 seconds ("). Based on 365 days a year

10

Angles of Time

1 angular unit per hour, 24hrs per circle. 1 hour = 60 minutes, 1 minute = 60 seconds. min and sec instead of ' and ". based on 24hr day

11

vector

a quantity with magnitude and direction

12

scalar

a single-quantity number

13

velocity

change in position over change in time. VECTOR quantity.

14

acceleration

change in velocity over change in time. vector value

15

force

f, push or pull. vector

16

energy

the potential to do work, always conserved and converted

17

Ek

kinetic energy, 1/2mv^2

18

pressure

force/unit of area. vector

19

momentum

movingness of something, conserved, vector value. P

20

momentum equation

P = m * v

21

angular momentum

tendency of something to continue rotating, conserved, vector. L

22

angular momentum equation

L=MVR (v and r are vectors)

23

star formation

angular momentum causes ball of gas to collapse into a rotating disk w/ protostar at middle.

24

changing L (angular momentum)

if L and mass stay same, velocity and radius vary inversely

25

light

electromagnetic waves, electric wave perpendicular to a magnetic wave

26

photon

packet of light

27

field

property of space. take a point of space- what fields are there?

28

amplitude

highest to lowest point of a wave

29

wavelength

lambda, trough to trough or peak to peak

30

long wavelength

red