A geocentric universe is Sun centered
a. True
b. False
Indicate whether the statement is true or false
False
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When a comet is within the inner solar system, its visible tails point
A) away from the Sun B) opposite the direction the comet is moving in its orbit C) perpendicular to the ecliptic plane D) always almost due north E) in the direction the comet is moving in its orbit
A __________ interacts via the strong interaction
Fill in the blank(s) with correct word
Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy
a. rotates faster than expected in its outer region. b. rotates more slowly than expected in its outer region. c. is only visible during a total eclipse of our Sun. d. is surrounded above, below, and well beyond by the brightly glowing corona.
150 g of liquid nitrogen at its boiling point of 77.0 K is stirred into a beaker containing 510 g of 18.0°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? The heat of vaporization of nitrogen is 48.0 cal/g and that of water is 80.0 cal/g
a. none b. 21 g c. 42 g d. 11 g e. 63 g