Scientific models are used to
A) present the scale of the solar system to the general public.
B) make specific predictions that can be tested through observations or experiments.
C) make miniature representations of the universe.
D) prove that past paradigms no longer hold true.
B
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The pregalactic blobs started with masses comparable to big globular clusters
Indicate whether the statement is true or false
Which of the following is true of Mars?
A) It is about 95 percent of Earth's diameter. B) It has a thick atmosphere rich in water vapor. C) It is the smallest planet of the Solar System. D) It has a heavily cratered crust marked by volcanoes.
Assume that the average mass of each of the approximately 1 billion people in China is 55 kg. Assume that they all gather in one place and climb to the top of 2 m high ladders. The center of mass of the Earth (mE = 5.90 1024 kg) is then displaced
a. 0 m. b. 1.84 × 10^?23 m. c. 1.84 × 10^?14 m. d. 1.80 × 10^?13 m. e. 2 m.
A thin metallic shell of radius 40 cm has a charge of -25 nC on it. At the center of the sphere is a point charge of 35 nC. What is the electric field 15 cm from the center of the shell?
a. 
b. 
c. 
d. 
e. 