A heater is rated at 1200 watts for a 120-volt source.The resistance of the heater is __________
Fill in the blank(s) with correct word
12 ohms
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Which of the following landscapes were not carved by glaciers?
A) The Grand Canyon B) Yosemite National Park C) The Swiss Alps D) The Great Lakes of North America
What is the potential difference VB ? VA when I = 0.50 A in the circuit segment shown below?
a.
+28 V
b.
+2.0 V
c.
?28 V
d.
?2.0 V
e.
+18 V
Which of the following Pluto observations did not help convince scientists to change Pluto's status from that of a planet?
A) discovery of the Kuiper Belt B) discovery of seasonal atmosphere, similar to comets C) discovery of large Kuiper Belt Objects D) discovery of Pluto's 5 moons
A 30-year-old astronaut goes off on a long term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth. Biologically speaking, the astronaut's age would be
A) more than 50 years. B) exactly 50 years. C) less than 50 years. D) exactly 30 years. E) exactly 25 years.