Earth is made mostly of metals and rocks. Where did most of the elements that make up these materials (carbon, silicon, iron, etc.) form?
A) They were produced by the Big Bang.
B) They were produced by chemical reactions in interstellar gas clouds.
C) They were produced by stars.
D) They were produced in our Sun.
E) They were produced by nuclear fission of uranium and other radioactive materials in space.
C) They were produced by stars.
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A test rocket is fired straight up from rest with a net acceleration of 20.0 m/s2. After 4.00 seconds the motor turns off, but the rocket continues to coast upward with no appreciable air resistance. What maximum elevation does the rocket reach?
A) 487 m B) 327 m C) 320 m D) 408 m E) 160 m
A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits?
A) Planet 2's semimajor axis is larger than Planet 1's. B) Planet 1's orbit is more eccentric than Planet 2's. C) Planet 2's orbit is more eccentric than Planet 1's. D) Planet 1's semimajor axis is larger than Planet 2's.
An eagle, with a wingspread of 2.0 m, flies due North at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.2 × 10-4 T
What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)
In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are
A) hydrogen. B) oxygen. C) both the same D) not enough information