The term age of reptiles is sometimes used to refer to the ______________ era
Fill in the blank(s) with correct word
Mesozoic
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Compared with our Sun, most stars in the halo are
A) young, red, and dim and have fewer heavy elements. B) young, blue, and bright and have much more heavy element material. C) old, red, and dim and have fewer heavy elements. D) old, red, and dim and have much more heavy element material. E) old, red, and bright and have fewer heavy elements.
Measured densities of extrasolar planets range from ________
A) water to iron B) styrofoam to iron C) styrofoam to water
60. mi/h is approximately
A) 20. m/s. B) 120. m/s. C) 30. m/s. D) 60. m/s. E) 30. km/h.
A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10^-27 kg, qProton = +1.6 × 10^-19 C.]