Each of the following is a prediction of the theory of relativity (special or general). Which one is crucial to understanding how the Sun provides light and heat to the Earth?
A) E = mc2
B) Gravity is curvature of spacetime.
C) If you observe someone moving by you, you'll see his or her time running slow.
D) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.
A) E = mc2
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Two electric charges QA = + 1.0 ?C and QB= - 2.0 ?C are located 0.50 m apart. How much work is needed to move the charges apart and double the distance between them?
A) -36 × 10-3J B) +18 × 10-3 C) 0 D) +36 × 10-3 E) -18 × 10-3
Why is the solar nebula theory considered a theory rather than a hypothesis?
a. It has extensive evidence and explains many observations of different objects. b. It solves the angular momentum problem, which is the main problem of Solar System formation research. c. It is based on mathematical models and previous calculations of molecular and particle properties. d. It is accepted by most scientists nowadays, and it is conventionally named as a theory
Each Voyager spacecraft carries a "postcard" designed to be understandable to any aliens that might someday encounter it. On the "postcard," scientists pinpointed the location of Earth by triangulating it between pulsars
Why did the scientists choose pulsars rather than some other type of star? A) Pulsars are very bright and therefore easy to find. B) Several pulsars are located within a dozen light-years of our solar system, making them useful for finding our solar system. C) We're pretty sure that aliens will have only radio telescopes and not optical telescopes, so they'll have a better chance of seeing pulsars than ordinary stars. D) Pulsars are easy to identify by their almost perfectly steady periods of pulsation.
A barge is 10.0 m wide and 60.0 m long and has vertical sides. The bottom of the hull is 1.20 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water?
A) 3.53 MN B) 6.39 MN C) 6.82 MN D) 7.06 MN E) 9.54 MN