Matter & Chemical Reactions
Force, Motion and Acceleration
Waves and the EM Spectrum
The Universe
100
What are 3 evidences of a physical reaction?
- change in size or shape
- melting, freezing evaporating
- dissolving, boiling
100
Explain how Newton's Third Law of Motion applies to a soccer ball being kicked.
When the foot puts a force on the ball, the ball puts force back on the foot.
100
What are the safer ES waves?
Radio, Microwaves, Infrared, Visible light
100
What is the life cycle of a star?
Nebula, Protostar, Main Sequence star
200
What are 3 evidences of a chemical reaction?
- burning
- residue/ precipitate
- bubbling/ fizzing
- color and temperature change
- new odor
200
A car accelerates at 3 m/s² when a force of 600 N is applied. What is the mass of the car?
200 kg
200
Which ES waves are not safe?
Ultraviolet, X-Ray and Gamma
200
Using the Hertzsprung-Russell diagram, classify a star that is very hot and very bright.
Blue Giant
300
In a chemical reaction, if the mass of the reactants is 50 grams, what should be the mass of the products? Why?
50 because the Law of Conservation of Mass says that mass stays the same in a chemical reaction
300
If a 20 kg object is subjected to a net force of 100 N, what is its acceleration?
5m/s2
300
When frequency is high, energy is ______ .
high
300
What color are lower temperature stars? Hight temperature stars?
Low- Redish
High- Blueish
400
A 75N force (East) is applied on an object. A second force of 175N (West) is applied on the object. What will happen to the object's motion? Provide the net force and direction.
100 N West
400
What is the average speed?
.8 m/s
400
When Wavelength is long, frequency is _____ .
low
400
The phenomenon that the universe exploded and is currently moving is called what?
The Big Bang Theory