Which statement correctly locates the formation of the Earth and the appearance of the first humans on the cosmic calendar, which compresses the 14-billion year history of the universe into one "year," where "now" is exactly midnight,
A) Earth forms in January, life begins in April, and humans appear in early December.
B) Earth forms in January, life begins in September, and humans appear in October.
C) Earth forms in early September, life begins in late September, humans appear a few hours before midnight, Dec 31.
D) Earth forms in early September, life begins in November, and humans appear on Dec 15.
C
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What two quantities did Edwin Hubble compare for a sample of galaxies to discover the expansion of the universe?
A) age and distance B) velocity and distance C) velocity and temperature D) luminosity and distance E) luminosity and temperature
The Crab Nebula is a bright, long-lasting supernova remnant that was made by a ________ supernova
Fill in the blank(s) with correct word
A worker pushes a sled with a force of 38.0 N over a level distance of 3.60 m. If a frictional force of 16.0 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
a. 194 J b. 137 J c. 57.6 J d. 79.2 J e. 6.11 J
Potential of Point-Charges: A 6.9 ?C negative point charge has a positively charged particle in an elliptical orbit about it. If the mass of the positively charged particle is 1.0 ?g and its distance from the point charge varies from 4.0 mm to 16.0 mm, what is the maximum potential difference through which the positive object moves? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 12 MV B. 3.9 MV C. -5.2 MV D. 19 MV