Astronomers measure stellar distances in three different units. The smallest of these is
a. the light-year.
b. the absolute magnitude.
c. the astronomical unit.
d. the parsec.
c
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A liquid cannot be heated simultaneously by conduction, convection, and radiation
a. True b. False Indicate whether the statement is true or false
Stars are born from the interstellar medium, and aging or dying stars return gas and dust back into the interstellar medium
a. True b. False Indicate whether the statement is true or false
Three 4.00-? resistors are connected in parallel to a 10.4-V battery. What is the current in any one of the resistors?
a. 14.4 A b. 6.76 A c. 2.60 A d. 41.6 A e. 6.40 A
In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
a. Block A has twice as much kinetic energy as block B. b. Block B has lost twice as much kinetic energy to friction as block A. c. Block B has lost twice as much kinetic energy as block A. d. Both blocks have had equal losses of energy to friction. e. No energy is lost to friction because the ground has no displacement.