The__________is the period of time after the glow of the big bang faded into the infrared and before the birth of the first stars, during which the Universe expanded in darkness
A) space age
B) dark age
C) atomic age
D) ice age
B
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When a particular resistor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.00 A. What is the rms current if the source frequency is doubled?
1.12.0 A 2.6.00 A 3.4.24 A 4.3.00 A 5.1.50 A
How far from a lens having a focal length of +50 mm must the object be placed if it is to form a virtual image that is 3.0 times the size of the object?
A) 33 mm B) 42 mm C) 48 mm D) 54 mm
A particle (q = 5.0 nC, m = 3.0 ?g) moves in a region where the magnetic field has components Bx = 2.0 mT, By = 3.0 mT, and Bz = ?4.0 mT. At an instant when the speed of the particle is 5.0 km/s and the direction of its velocity is 120° relative to the magnetic field, what is the magnitude of the acceleration of the particle?
a. 33 m/s2 b. 17 m/s2 c. 39 m/s2 d. 25 m/s2 e. 45 m/s2
The Hubble Space Telescope has recently strengthened the case for a subsurface ocean on Ganymede by observing
A) changes in time of auroras surrounding the moon B) a thin atmosphere of water vapor above the surface C) salts on its surface D) jets of water erupting from the surface