Which two methods can be combined to determine an extrasolar planet's density?
A) Doppler and astrometric observations
B) Doppler and transit observations
C) Doppler and gravitational lensing observations
D) astrometric and gravitational lensing observations
B) Doppler and transit observations
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Approximately how long does it take light to reach the Earth from the Sun?
a. 1 min b. 8 min c. 1 ly d. 8 ly e. 1 AU
A closed loop conductor that forms a circle with a radius of is located in a uniform but changing magnetic field
If the maximum emf induced in the loop is what is the maximum rate at which the magnetic field strength is changing if the magnetic field is oriented perpendicular to the plane in which the loop lies? A) 0.40 T/s B) 2.5 T/s C) 0.080 T/s D) 5.0 T/s
Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
A. 58 V B. 63 V C. 43 V D. 84 V E. 11 V
The boundary between two air masses is called a
a. squall line. b. blizzard. c. tornado. d. front.