Notes Astronomy Observing Tools
What if you wear glasses?
What to know about
Notes Astronomy How did the universe begin
How did the universe begin
There are three main theories of the origin of the universe.
Big Bang theory
Steady State theory
Big Bang Theory
Billions of years ago the universe was packed in a s
Notes Astronomy Parts of the Sun
Core: Center of Sun, hottest part. Nuclear fusion takes place
Convection Zone: Full of hot gases. Energy released
Photosphere: Source of sunlight. Visible part of Sun
Prominences: Flame-like gases that travel outward
Notes Astronomy Newtons Laws of Motion
Newtons Laws of Motion
A body at rest, or in uniform motion, will remain so unless acted
upon by an unbalanced force.
The change in motion (acceleration) is proportional to the
Notes Astronomy Newtons The study of light
The study of light
Visible light is only one small part of an array of energy
Electromagnetic radiation includes
Notes Astronomy Phases of the Moon
Phases of the Moon
Half of the Moon is ALWAYS lit-up
The Moon appears to have phases because it is revolving around us.
Rotation: 27 1/3 days
Notes Astronomy Precession
At left, gravity is pulling on a slanted top. => Wobbling
around the vertical.
The Suns gravity is doing the same to Earth.
The resulting wobbling of Earths axis of rotation around the vertical w.r.t. the
Notes Astronomy The Sky
In ancient times, constellations only referred to the brightest stars that appeared
to form groups, representing mythological figures
Today, constellations are well-defined regions on the sky, irrespective of the
Notes Astronomy White Dwarf
Most of the stars fuel in the outer layers is used up
Shrinks and collapses
(about the size of Earth but heavier)
Gives off a white light
Remaining fuel is used up
Star is dead
Basic Sun Facts
Notes Astronomy Modern Astronomy
The Birth of Modern Astronomy
Copernicus concluded that Earth is a planet. He proposed a model of the solar
system with the sun at the center. Heliocentric Model
This model explained the retrograde m
Notes Physics ENERGY
Energy is the ability to do work.
Which of these is not a form of energy?
The Earth is a magnet.
The Law of Conservation of Energy
Energy cannot be created or destroyed
E= m x C2
Matter can be co
Notes Physics Output Devices
Loudspeaker-electrical to sound
L.E.D.-electrical to light
Bulb-electrical to light
Buzzer electrical to sound
Relay-electrical to movement
L.E.D. has to be protected by adding in a series resistor to take
Notes Physics Where Does Electricity come From
Be safe around electricity
Electricity can be very dangerous. You should never put anything into electric
sockets, except plugs.
Never touch appliances, wires or electrical switches with wet hands or feet.
Notes Physics ELECTRICITY EQUATIONS
P = I2R
RT = R 1 + R2
1 /RT = 1/R1 + 1/R2
RULES FOR SERIES AND PARALLEL CIRCUITS
VOLTAGE SPLITS UP IN A SERIES CIRCUIT
CURRENT STAYS THE SAME IN A SERIES CIRCUIT
Notes Physics ENERGY IN THE HOME
By the end of this unit you should:1. Know that energy is required for heating, lighting and operating appliances.
2. Know that energy can be supplied from electricity, gas oil, or solid fuel.
3. Know that the cost of home
Notes Physics ELECTRICITY
Value of mains supply = 230V
Fuse is used as a safety device
Prevents too much current flowing in circuit.
Power of appliances measured in watts (W)
Plug wires colors
Notes Physics Color by Transmission
Color by Transmission
The color of a transparent object depends on the color of the light that is
A piece of blue glass transmits blue light.
Pigment is the material in the transparent glass that selectivel
Notes Physics Color
: The Color Spectrum
Isaac Newton was the first to make a systematic study of color.
He did this by passing a narrow beam of sunlight through a triangular-shaped
His method showed that sunlight is composed of a mixture of
Notes Physics Mixing Colored Pigments
Mixing Colored Pigments
Mixing red, green, and blue paint is entirely different from the mixing of colored light.
-Pigments absorb light of a relatively wide range of frequencies.
-Subtractive primary colors are three
Notes Physics HEALTH
TYPES OF THERMOMETER
1. THE LAB THERMOMETER
2. THE CLINICAL THERMOMETER BOTH LIQUID IN GLASS
3. THE DIGITAL THERMOMETER
LAB AND CLINICAL THERMOMETERS
MAGNIFIER IN CLINICAL THE