Sound & Vibrations
What determines the volume of a sound?
The amount of air in the crests (size of waves)
When a molecule decomposes, it:
breaks down into smaller components
Why do scientists repeat experiments?
They look for different results, which may indicate error.
What is Archimedes’ Principle?
Water pushes up with a force equal to the weight of displaced water.
How did Hero of Alexandria determine his mirror answer?
He used the Law of Reflection
If a string vibrates very slowly, does it produce high or low pitch?
Low pitch
Why does rest help a person fight sickness?
Rest conserves energy for cellular repair and immune response.
Is our solar system geocentric or heliocentric?
Heliocentric
An object weighs 50 lbs. When put in water, it displaces 40 lbs of water. If you lift it underwater, how much would it feel like it weighs?
10 lbs
What is retrograde motion?
A planet appears to reverse direction temporarily.
If a string is plucked hard, is the sound soft or loud?
Loud
What is a doctor measuring with pulse rate?
How quickly blood is flowing through the body
Is this statement true or false? A siphon only works if air can get into it.
False
What is Eratosthenes best known for measuring?
The circumference of the earth
In Ptolemy’s model, planets traveled slowly in their orbits but quickly in their…
Epicycles
Besides speed, what three other things affect the pitch of a vibrating string?
String tension / thickness / length
Boethius said sound should be thought of as:
Ripples of air like in water
Is this statement true or false? A curved mirror produces the same reflection behavior as a flat mirror.
False
What is a siphon?
A device that moves liquids from one place to another
What is refraction?
Light bending when it enters a new substance.