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

Loading flashcards...

0

## 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