Test 1 Flashcards
Kinetic energy can be measured in
Calories
One watt is equivalent to
One joule / second
Power formula
Energy / Time
T / F watt is a unit of energy
False
Kinetic energy of 1 gram metro is equal to energy how much TNT?
150 grams
Compared to TNT a meteor with same mass has how much greater energy?
165x greater
Compared to kilogram of flashlight batteries, a kg of gasoline has how much more energy?
70 times more
Nucleus contains how much of the mass of an atom
99.99%
Alexander Litvineko was assassinated by
polonium
1 Sievert = ? rem
100 rem
How many people die from cancer
1 of 5
Big half life decays slower or faster than one with a small life
slower
Watch dials with radium glow because
radiation hits a phosphor
An explosion occurs when
stored energy is suddenly converted to heat in a confined space
Energy definition
the ability to do work
Heat definition
something that raises the temperature of something else
Energy in cookies vs. TNT
cookies have 8x more than TNT
*TNT releases energy much more quickly
Calorie
1 Calorie = 1 watt hour
1 kWh = 1,000 calories
Joule
1 calorie = 4,200 joules
1 kWh = 3.6 million joules
1 Watt = 1 joule / second
1 Gram Energy measurements (calories)
- Uranium-235 = 20 million calories
- Gasoline = 10 calories
- Coal = 6 calories
1 Gram Energy measurements (joules)
- Uranium-235 = 82 billion joules
- Gasoline = 42,000 joules
- Coal = 27,000 joules
Gasoline vs. Car Battery
- battery contains 340x less energy per gram than gasoline
- Battery has 85% efficiency, gas is 20%
- Overall batter is 80x less than gas
Hydrogen vs. Gas
- Hydrogen has 3x more energy than gas (in grams)
2. 3x less energy than gas (in gallons)
TNT vs. Uranium
30 million times more energy
Power Equation
Power = Energy / Time
First Law of Thermodynamics
Energy that appears to be lost is actually just converted into heat
