The power rating of a 400-? resistor is 0.25 W. What is the maximum voltage you can safely connect across its ends?
A) 10 V
B) 20 V
C) 30 V
D) 40 V
E) 50 V
A
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The Moon has been unable to hold any atmosphere because:
A) it has a low escape velocity. B) it cooled very slowly during its formation. C) its orbital velocity is higher than its escape velocity. D) its gravitational acceleration is more than 10 m/s2.
Consider a compass with a square magnet placed in a uniform electric field, as shown below. If the magnet is free to pivot around an axis pointing toward the viewer that goes through the point at the magnet’s center, which way will it turn (if it does) in this field?
A. Clockwise, to align itself with the field.
B. Counter clockwise, to align itself with the field.
C. 180° either clockwise or counter clockwise.
D. It won’t turn, as it is already aligned with the field.
E. It won’t turn, because the field wants to twist it around a different axis altogether.
F. It won’t turn because it is not affected by this field.
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids B) different organisms use different sets of amino acids C) all proteins are made of amino acids D) some organisms don't use amino acids at all
A battery supplies 6.0 mA to a 12-? resistor for 1.5 h. How much electric energy does this resistor dissipate in this time?
What will be an ideal response?