KE
What is the equation for mechanical kinetic energy?
Ek = 1/2 mv2
What is the equation for gravitational potential energy?
Eg = mgh
What are the three types of nuclear radiation?
Alpha, Beta, Gamma
How does gravitational potential energy effect Earth?
The moon (GPE) is responsible for the tides.
State the law of conservation of energy.
the total energy of an isolated system remains constant. Energy can not be created or destroyed.
How much kinetic energy does a 4kg bunny running at 3.6m/s have?
25.92 J
How much potential energy does a 1.2kg book sitting on top of a shelf that is 1.4m high have?
16.48J
Why are some atoms unstable?
Too many neutrons compared to the number of protons
Why are greenhouse gases both good and bad for the Earth?
We need the higher temperature to support life but too high is dangorous.
Describe why terrestrial ecosystems are more prone to damage from radiation exposure and global warming.
Aquatic systems can flush radiation. Aquatic systems take more energy to change temperature.
A baseball is hit at a speed of 20.8 m/s and has 165 J of energy. What is the mass of the baseball?
0.76kg
A 15kg weight sits on a desk and it has 236J of energy. How tall is the desk?
1.60 m
various answers but alpha particle present
Why are clouds and the atmosphere so important when it comes to solar energy?
They block up to half of the solar energy from reaching the surface of the Earth.
A ball is dropped from a height of 3.2m. What is the velocity of the ball right before it hits the ground?
7.92 m/s
Show the steps of rearranging the kinetic energy equation to solve for velocity
Ek = 1/2 mv2
2Ek = mv2
2Ek/m = v2
v = sqrt (2Ek/m)
You throw a .21kg bouncy ball out your window that is 2.6m from the ground. The ball bounces back up to 75% of the height of your window where your sibling catches it. What was the CHANGE in energy of the ball?
1.34 J
Why does gamma decay happen?
Typically, after alpha or beta decay the nucleus is in an excited state and thus is unstable and undergoes gamma decay.
DAILY DOUBLE
Mr. Furby special question. Wager up to all your points
If the mass of the average cat is 6.2 kg, and Mr. Furby has 3 cats, how much energy does the Sun output daily?
Give an example of a piece of technology and describe how it transforms energy to help us.
Various (i.e. Battery transforms chemical PE to chemical KE which helps us everyday)
List at least 5 types of kinetic energy
Mechanical, Thermal, Radiant, Sound, Electric
List at least 5 types of potential energy
Chemical, gravitational, electric, nuclear, elastic, magnetic
What is the most stable element?
What is the most UNstable element?
Stable elements - Even protons and neautrons (various examples)
Unstable - High difference in number of protons to neautrons.
What are the three main types of energy that effect earths systems?
Nuclear, Gravitational, Solar
Give an accurate example of a system and ALL its surroundings
Various (i.e. a sealed beaker, sealed in a large closed off space as the surroundings)