Wildcard 1
Wildcard 2
Units and Numbers
Velocity
Acceleration
100
Why can’t we see through walls?
We see the photons emitted by electron energy level jumps, not physical objects.
100
What element is the most common in air?
Nitrogen, it’s about 70%.
100
What are the base SI units of acceleration?
m/s^2
100
Traveling at 22m/s, how far does a vehicle go in 20s?
440 m
100
Can acceleration be negative?
yes
200
Do you feel your own weight?
No, you feel the force of the world pushing upwards on your feet.
200
Which freezes faster, hot water or cold water?
Sometimes hot water, but that’s not always true.
200
What is the mass of Earth (just get it within 10x)?
5.972*10^24 kg
200
What is the velocity of a vehicle that travels 300m in 15s (give the answer in m/s)?
20 m/s
200
What's the acceleration due to gravity on Earth's surface?
g=9.81 m/s^2
300
How far are you from Earth right now?
One radius of Earth, 6378km.
300
How heavy is the Pacific ocean?
Pacific Ocean covers 28% of the planet’s surface
Planet’s radius is 6378km and the surface area is 
.
Average depth is 4280m. Use that to find V if it’s a cylinder.
Multiply volume by density of water and gravity.
300
Which number is bigger?
10^10 * 10^10 or (10^5)^5
(10^5)^5
300
How long does it take to go 705km if you're traveling at 80 km/h?
8.81s
300
If a rocket accelerates at 30 m/s^2 for 5 minutes, what is it's final velocity?
9000 m/s
400
Where does sound travel faster, in the air or in water?
It’s much faster in water. In air 
, in water 
.
400
Why are sunsets red?
Earth’s atmosphere blocks more blue light than right light, so if the light passes through more atmosphere, it looks redder.
400
What are the base SI units of energy?
kg*m^2/s^2
400
What's the average vertical velocity of a projectile?
0 m/s
400
How long does it take to reach terminal velocity, 52.7 m/s, if you're falling at g=9.81m/s^2?
5.37s
500
Are the atoms in your feet touching the atoms in the floor?
No, they’re separated by about 0.5nm due to electric repulsion.
500
Why do bubbles pop?
The internal pressure inside of the bubble is higher than the outside air. If there is a small hole in the thin film, the air escapes.
500
What is the fastest velocity any land vehicle has ever traveled (the land speed record) in units of m/s?
Guess within 10x
341 m/s (762 kmph)
500
Find the average velocity of an object that travels at 20m/s for 10s, stops for 1 minute, then travels in the same direction at 10m/s for another 10s.
3.75 m/s
500
Find the average acceleration of an object that accelerates at 10m/s^2 for 10s, then decelerates at 5 m/s^2 for 5s, before accelerating at 10m/s^2 for another 10s.
7 m/s^2