Mass Energy

1
Mass Energy

• E mc2
• Energy and mass are equivalent
• C 3 x 108 m/s.
• C is a big number and its squared! So even if m
  is small, E is big.
• A small mass, converted to energy, gives a lot of
  energy!

2
Example
3
Electromagnetic energy

• Light displays properties of both waves and
  particles.
• Light is an electromagnetic wave-a wave created
  by alternating electric and magnetic fields.
• Light is more than just visible light, it
  covers wavelengths from radio thru Gamma rays
• Light is also a particle called a photon.
• Photons have energy given by Eh? or Ehc/?. H is
  constant, c is the speed of light , ? is the
  frequency of light and ? is the wavelength of the
  light.

4
Conservation of Energy

• The principle of conservation of energy states
  that energy cannot be created or destroyed. But
  it can be converted from one form to another
• This idea of energy transformation is at the
  heart of energy generation.

5
Energy Sources renewable vs non-rewnewable

• Renewable cant be exhausted
• Solar
• Geo-thermal
• Tidal
• Wind
• Hydro

• Non-renewable-can be exhausted
• Fossil fuels (oil, coal etc)
• Nuclear

6
How much do we use?

• World energy consumption

• US energy consumption

7
How much do we use?
8
How much do we use?

• Almost 95 of the energy we use comes from
  non-renewble energy sources!
• One of these days we will run out, and then what?
• What are some short and long term answers to this
  question?

9
Fossil fuels
10
FOSSIL FUELS

• Carbon or hydrocarbons (a compound made of
  hydrogen and carbon) found in the earths crust
• Formed from the bacterial decay of plant and
  animal life in ancient (a few hundred million
  years ago) seas.
• The decomposing material was covered with mud and
  sediment
• This increased the pressure and temperature on
  the material and deprived it of oxygen.
• A variety of hydrocarbon molecules are created in
  solid, liquid and gas states.
• The gas and liquid could travel through the
  porous rock and collect in geological traps (rock
  features that prevent further movement of the
  hydrocarbons).

11
Petroleum traps