Show:
Full of Hot Air
There's Just No Way Around It
Feeling Little Gassy
May the Force
Be With You
Scratching the Surface
100
What determines density?
Density is determined by how tightly packed together molecules in an object are.
100
What is the relationship between the diameter and radius of a circle?
D= 2R
100
Name 3 gases that make up the Earth's atmosphere.
Nitrogen (N2) 78.084% Oxygen (O2) 20.946% Argon (Ar) 0.934% Carbon dioxide (CO2) 0.0383 % Neon (Ne) 0.001818 % Helium (He) 0.000524 % Methane (CH4) 0.0001745 % Krypton (Kr) 0.000114% Hydrogen (H2) 0.000055 % There is also a varying amount of water vapor, depending on the altitude and conditions where it is measured.
100
A push or a pull is also known as...
What is "force"?
100
What is the area of a rectangle with a width of 8 cm and a length of 11 cm?
L x W =A 88 cm squared
200
What word describes the lack of density in an object as determined by how loosely packed molecules in the object are?
buoyancy
200
What is the radius of a circle with a diameter of 32 cm?
16cm
200
Which of these gases tends to be more buoyant at room temperature? Oxygen, Methane, Helium
Helium
200
The Law of Inertia states that an object at rest will stay at rest and an object in motion will stay in motion in a straight line and constant speed until an outside force acts upon it. This is known as...
Newton's 1st Law of Motion
200
What is the remaining area of an L shaped figure where the length of the longest side is 10 cm, the width of the uncut side is 7 cm, the length of the missing piece is 3 cm and the width of the missing piece is 4 cm?
(uncut LxW) - (missing l x w) = remaining area 58 cm squared
300
Explain the science behind how hot air balloons acheive lift and how they are able to descend.
When air in the balloon is heated, the molecules begin moving more rapidly due to the increased energy in the form of heat. As the molecules move quickly, they expand and more space is created between the individual molecules, allowing the air to be more buoyant. As the air cools, and energy is reduced, the molecules in the air contract and become more dense, thus lowering the balloon.
300
What is the definition of circumference?
Circumference is the distance around the perimeter of a circle.
300
Which gas is the lightest existing gas? (14 times less dense than air)
Hydrogen
300
This force is caused by objects rubbing together and may stop or stop an object.
What is friction?
300
What is the area of a right triangle with whose longest side (A) measures 10 cm and whose shortest side (B)measures 6 cm?
1/2 times A times B = A 30 cm squared
400
What time of day is best for balloon flights and why? (Explain the science behind your thinking.)
Early morning is the best time to launch a balloon because the surrounding air temperature in the atmosphere is usually lower .The hot air in the balloon by comparison is much more buoyant, allowing greater lift while requiring less energy (heat).
400
What is the formula for finding the circumference of a circle?
diameter times pi (3.14) = circumference
400
This gas is sometimes used to fill weather balloons. Due to its high boiling point (compared to helium and hydrogen), this gas could potentially be refrigerated and liquefied aboard an airship to reduce lift and add ballast (and returned to a gas to add lift and reduce ballast). This gas is relatively heavy (0.6 kg/m3), poisonous, and an irritant.
What is Ammonia?
400
What is Newton's Third Law of Motion?
For every action there is an equal and opposite reaction.
400
What is the area of a circle whose radius measures 10 cm?
pi times radius squared 3.14 times 100= 314 cm squared
500
How can the volume of a hot air balloon (assuming it is a spherical shape) be determined?
Volume of a sphere = 4/3 times pi times radius cubed
500
pi times the radius squared = area 3.14 x 9=28.26 square inches
What is the area of a circle what has a diameter of 6 inches?
500
This gas has the advantage that it is inert and abundantly available, because it is the major component of air. However, because it is only 3% lighter than air, it is not an obvious choice for a lifting gas. Nevertheless, an aerogel named SEAgel (Safe Emulsion agar gel) has been produced that floats in air if it is filled with a pure form of this gas.
What is nitrogen?
500
Force = mass times acceleration is also known as...
Newton's 2nd Law of Motion
500
What irregular, yet common, shape would you be finding the area for if you multiplied pi times the radius squared and then divided your answer by 4?
a quarter of a circle