If ? = 40° and the tension in string 2 is 30 N, determine M
a.
3.4 kg
b.
3.6 kg
c.
2.6 kg
d.
4.9 kg
e.
7.5 kg
c
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Neutron stars must ____
a. rotate very rapidly b. be very luminous c. have weak magnetic fields d. have a mass greater than three solar masses e. have about the same surface temperature as the star that created them
The Jovian problem refers to
a. the high speed with which the Jovian planets rotate on their axes. b. the large number of satellites that orbit each Jovian planet. c. the existence of rings around the Jovian planets. d. the excess heat radiated by the larger of the Jovian planets. e. the apparently short period of time that disks exist around stars from which Jovian planets can form.
Why do Uranus and Neptune have blue methane clouds but Jupiter and Saturn do not?
A) Methane does not condense into ice in the warmer atmospheric temperatures of Jupiter and Saturn. B) Methane did not exist in the solar nebula at the radii of Jupiter and Saturn when the planets formed. C) The greater gravitational force of Jupiter and Saturn prevents the methane from rising to the upper edges of the atmosphere. D) Methane reacts with the abundant ammonia clouds in Jupiter and Saturn. E) The relatively slow rotation of Uranus and Neptune allows methane to migrate to higher levels in the atmosphere and condense into clouds.
The cosmic microwave background is:
A) redshifted in the direction of Earth's motion. B) redshifted in the direction of the Sun's motion. C) redshifted in the direction of the center of the Milky Way. D) blueshifted in the direction of Earth's motion. E) blueshifted in the direction of the Virgo Cluster.