A scientific theory [or scientific principle] could best be described as
A) an idea that has been proven by observations of the natural world.
B) an idea that explains a large collection of observations of the natural world.
C) a tentative guess about the way the natural world operates.
D) an observed fact or collection of facts about the natural world.
E) any mental picture, or idea, about the way that the natural world operates.
B
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Hubble found a direct relation between a galaxy's velocity and distance
Indicate whether the statement is true or false
Satellite Motion: You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 1.8 × 107 m. You have previously determined that the planet orbits 2.9 × 1011 m from its star with a period of 402 earth days. Once on the surface you find that the acceleration due to gravity is 19.5 m/s2. What are the masses of (a) the planet and (b) the star? (G = 6.67 × 10-11 N ? m2/kg2)
A. (a) 2.4 kg × 1025 kg, (b) 1.2 kg × 1031 kg B. (a) 4.3 kg × 1025 kg, (b) 1.2 kg × 1031 kg C. (a) 2.4 kg × 1025 kg, (b) 7.1 kg × 1030 kg D. (a) 4.3 kg × 1025 kg, (b) 7.1 kg × 1030 kg
A dog has three puppies. Spot weighs 12 ounces. Rascal weighs 9.5 ounces. Socks weighs 10.2 ounces. What is the total weight of the litter expressed to the correct number of significant figures?
A) 31.7 ounces B) 31 ounces C) 32 ounces D) 30 ounces E) 31.70 ounces
The ________-type seismic waves can travel through liquids and solids. The ________-type seismic waves can travel through solids only.
A. P; S B. S; S C. S; P D. P; P