The Greek astronomer who assigned the stars to six magnitudes was named ______________
Fill in the blank(s) with correct word
Hipparchus
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How does a radio station transmit a radio signal to your ear?
A) Electrons moving in the station's antenna send out an electromagnetic wave that travels to your radio, where the wave is amplified and sent to your ear as a more intense electromagnetic wave. B) Electrons moving in the station's antenna send out an electromagnetic wave that travels to your radio, where the wave is transformed into a sound wave that travels to your ear. C) Stationary positive and negative charges residing on the station's antenna exert electrostatic forces that act on your radio, causing the radio to send sound waves to your ear. D) The station's antenna sends an electric current through a wire that runs from the radio station to your radio, causing the radio to send sound waves to your ear. E) Electrons moving in the station's antenna send out a sound wave that travels to your radio, where the wave is amplified and sent to your ear as a more intense sound wave.
When current is flowing in a superconductor, which statement is not true?
a. A battery is needed to keep the current going. b. Electrical charges are moving. c. The resistance is zero. d. No power is given off in the form of heat.
Given that the charge on an up quark is +2/3 and the charge on a down quark is ?1/3, which combination represents a proton?
A. uud B. udd C. uuu D. ddd
One possible feedback effect of global warming that could "run away" unpredictably is
A) warming of the Pacific ocean stops the El Niño phenomenon which leads to further warming of the Pacific. B) warming leading to decreased cloud cover leading to further warming. C) ozone depletion that allows more ultraviolet to strike Earth, leading to further ozone depletion. D) melting Arctic ice leading to increased absorption of radiation leading to further warming.