Physics Important 2

Explain how electrons transfer thermal energy throughout metal

1. What happen to electron ex gained thermal energy

2. How they transfer ex move freely through metal

3. What they do ex collide with other particles in lattice

4. Causes ex particles vibrate faster

Define weight

weight is the gravitational force on a mass

Equation relating v and distance d of a far galaxy

d/v= 1/Ho

v/d= H

whats kilowatt-hour(kWh)

Unit of energy

Definition

energy transferred in one hour at a rate of transfer of 1 kW

Diameter of milky way

100,000 light years

Expain how redshift supports Big Bang Theory

galaxies are receding OR the Universe is expanding

• more distant galaxies are receding faster

• galaxies were closer together

what is mass

quantity of matter

arrangement of 8 planets

Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune

State in terms of energy transfers why temperature remains constant

Rate of transfer of energy from the object is equal to rate of transfer of energy to the object

Radium 223 is injected into the body to treat a specific organ

explain why the source must be inside the body

Isotope emitting gamma rays is injected into body to detect cancer in organs

explain why a source of gamma radiation is used

gamma / radiation needs to pass out of the body (to detector)