As of 2008, most known extrasolar planets have been discovered by
A) the astrometric technique.
B) the Doppler technique.
C) the transit technique.
D) the Hubble Space Telescope.
C
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Helioseismology is the study of the differential rotation and magnetic field of the sun
Indicate whether the statement is true or false
The full Moon is brighter than Venus regardless of how bright Venus is in the sky on any night as viewed from Earth
a. True b. False Indicate whether the statement is true or false
That Polaris will not always be the pole star is due to
A) the sidereal day being shorter than the solar day. B) precession shifting the celestial pole. C) the Moon following the ecliptic, instead of the equator. D) the Earth's revolution being slightly less than exactly 365.25 days. E) the Solar winds blowing the Earth farther away from the Sun.
A object on a spring undergoes SHM. When the object passes through the equilibrium position, which of the following statements about object-spring system are true? (There could be more than one correct choice.)
A) Its acceleration is zero. B) Its speed is zero. C) Its elastic potential energy is zero. D) Its kinetic energy is a maximum. E) Its total mechanical energy is zero.