Which of the following gives evidence of the solar wind?
A. the tails of comets
B. solar flares
C. solar prominences
D. sunspots
E. jet streams on Earth
Answer: A
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An object is 12 cm in front of a concave spherical mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 0.25 cm B) 15 cm C) 4.0 cm D) 2.4 cm E) 1.3 cm
One of the most remarkable discoveries by biologists over recent decades is that life can
A) survive in an astonishing variety of environments B) only exist in a very narrow range of environments C) only exist under conditions that exist on Earth D) survive in any and every environment, however harsh
A 1000-kg car is moving at 15 km/h. If a 2000-kg truck has 23 times the kinetic energy of the car, how fast is the truck moving?
A) 51 km/h B) 72 km/h C) 61 km/h D) 41 km/h
Calculate the ground state energy of a harmonic oscillator with a classical frequency of 3.68 × 1015 Hz. (1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s)
A) 7.62 eV B) 11.4 eV C) 5.71 eV D) 15.2 eV