A transformer with 120. turns in its secondary supplies 12. volts at 220. ma to a toy train. The primary is connected across a 120. V wall outlet
(a) How many turns are in the primary?
(b) What is the primary current?
(c) What power is delivered by the wall outlet?
(a) 1.2 × 103
(b) 22.0 mA
(c) 2.64 watts
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The main chemical building blocks of life, carbon, nitrogen, oxygen, and iron were formed
A) inside interstellar gas clouds during star formation B) in the center of the Earth and then ejected onto the surface via volcanism C) in the nuclear burning cores of stars and then ejected into space when they died D) in the Big Bang that created the universe
How much heat is produced in the 10-? resistor in 5.0 s when ? = 18 V?
A. 72 J B. 32 J C. 50 J D. 18 J E. 90 J
Temperature increases with altitude in the
A) troposphere. B) thermosphere. C) mesosphere. D) all of these
Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram
a. cooler b. brighter as seen from Earth c. larger d. smaller e. more massive