A proton has a total energy of 2.5 × 10?10 J. How fast is it moving? (mp = 1.67 × 10?27 kg)
A. 0.90c
B. 0.80c
C. 0.70c
D. 0.60c
E. 0.40c
Answer: B
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A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration becomes
A) 0 m/s2. B) 5 m/s2. C) 10 m/s2. D) infinite. E) none of the above
A constant magnetic flux through a closed loop of wire induces an emf in that loop
Indicate whether the statement is true or false
Galactic cannibalism refers to
a. binary galaxies. b. the merging of galaxies. c. galaxies drawing in gas from the intergalactic medium. d. the destruction of a galaxies globular clusters by the galaxies nucleus. e. none of these
Copernicus
a. proposed that the Earth orbited the Sun. b. showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun. c. neither proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun. d. both proposed that the Earth orbited the Sun and showed how retrograde motion could be explained without epicycles if the planets all orbited the Sun.