Terms
Which is larger?
Who did it?
What does it mean?
Force Review
100
Space and all matter and energy in it is the ___.
406
Universe
100
Which is larger, a solar system or a galaxy?
406
A galaxy is larger.
100
Who formulated the Law of Universal Gravitation? 408
Newton Einstein Lemaitre Gamow
Newton
100
The two factors that determine the strength of gravity are the mass of the objects and the __ between them. 408
distance
100
What is the net force? [Don't forget the direction.] 32
50 N right [Subtract the opposing forces to find the net force.]
200
Larger than star clusters, they contain millions to billions of stars. 406 Ours is called the Milky Way.
galaxies
200
Which is larger, a galaxy or the universe? 406
The Universe is larger.
200
Who developed the theory of 'general relativity' that explains how space and time are curved? 408
Einstein
200
Einstein's Theory of Special Relativity states that space and ___ are relative. 408
time
200
In this picture the net force is zero because the forces are _____. 32
balanced
300
Edwin Hubble discovered a __ , an apparent shift toward longer wavelengths of light. 409
redshift
300
Which is larger, a galaxy cluster or a star cluster? 406
a galaxy cluster
300
Who developed the theory of special relativity, that space and time are relative?
Einstein
300
What does 'C' stand for in physics equations?
The speed of light is the only Constant, because it always travels the same speed.
300
What is the net force? [Give the direction AND the amount of force.] 32
400 N to the right [You subtract the opposing forces to find net force.]
400
What are the largest structures that makes up the Universe 406
superclusters
400
Which order is correct, from smallest to largest? 406
A. galaxy cluster, galaxy, universe
B. galaxy cluster, solar cluster, universe
C. galaxy, galaxy cluster, universe
D. star cluster, solar system, universe
C. galaxy, galaxy cluster, universe
400
Who first observed a redshift of stars, and that almost all stars are moving away from each other and that the universe is expanding? 409
Hubble
400
George Gamow and his student proposed that the elements hydrogen and ___ formed between 3 and 20 minutes after the universe began. 409
helium
400
What is the net force? Will they move? 32
0 N You subtract for net force.
18-18=0 No they won't move.
500
How fast is 'C ', the speed of light in a vacuum? 138, 222
300,000 km/sec OR
3,000,000 km/sec OR
186,000 mi/sec
500
Which order is correct, from smallest to largest? 406
A. solar system, star clustar, galaxy, universe
B. solar system, galaxy, star cluster, universe
C. solar system, star cluster, galaxy cluster, galaxy
D. solar system, galaxy cluster, star cluster, universe
A. solar system, star clustar, galaxy, universe
500
Who outlined a theory that explained how elements formed in the universe? 409
Gamow
500
General Relativity says that ____ and time curve. 408
space
500
What is the total mass of the men and the sofa? Your answer will be in kilograms. 36
180 kg (heavy sofa)
f = ma so m = f/a 45/.25 = 180