The mass of a star is 8.0 × 10^30 kg, and the mass of a hydrogen atom is 1.67 × 10^?27 kg. If we assume that the star is mostly composed of hydrogen, approximately how many atoms are there in the star?
a. 1.3E+4 atoms
b. 2.1E–58 atoms
c. 4.8E+57 atoms
d. 8.0E+30 atoms
c
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Which of the following statements is not true about the sky at Earth's equator?
A) The Sun will pass directly overhead around noon each day. B) Over the course of the year, all 88 constellations will at some point be visible in the evening sky. C) There are no circumpolar stars in the equatorial sky. D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
When mass is transferred from one star to another in a close binary system, __________ momentum is conserved
Fill in the blank(s) with correct word
Recent evidence suggests that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth?
A) Mars rotates much slower than the Earth. B) The Martian core is made of rock, while Earth's core is made of metal. C) Mars's interior has cooled so much its molten core layer no longer undergoes convection. D) Mars is too far from the Sun to have a global magnetic field.
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5.0 km if we neglect the earth's rotational effects? (The mean radius of the Earth is 6.38 × 106 m, G = 6.67 × 10-11 N ? m2/kg2.)
A) -0.60 N B) -1.5 N C) -2.6 N D) -3.6 N E) -5.2 N