Which of the following best describes what we mean by the universe?
A) a vast collection of stars that number as many as the grains of sand on all the beaches on Earth
B) the sum total of all matter and energy
C) all the galaxies in all the superclusters
D) The universe is another name for our Milky Way Galaxy.
B
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A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC
A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have
A) equal temperatures. B) your temperature. C) equal conductivities. D) none of the above
The Young's modulus for aluminum is 7.02 × 10^10 N/m2 . If the speed of sound in aluminum is measured to be 5.10 km/s, find its density (in kg/m3)
a. 11.3 × 10^3 b. 7.80 × 10^3 c. 2.70 × 10^3 d. 29.3 × 10^3 e. 1.40 × 10^3
When a metamorphic rock is melted and then re-solidifies it turns into
A) an igneous rock B) a sedimentary rock C) a meteorite D) another metamorphic rock