Elements such as carbon, silicon and oxygen have been produced in stars and expelled as stars age in the interstellar medium. This is most likely due to these elements having cooled and condensed from aging stars to form dust grains, and carried out by a powerful winds
a. True
b. False
Indicate whether the statement is true or false
True
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Consider the waves on a vibrating guitar string and the sound waves the guitar produces in the surrounding air. The string waves and the sound waves must have the same
A) wavelength. B) velocity. C) frequency. D) amplitude. E) More than one of the above is true.
Suppose the gravitational potential energy for a mass at an altitude of one Earth radius is PE1 and at two Earth radii is PE2 . How do the absolute values of these potential energies compare?
a. |PE1| = 2|PE2| b. |PE1| = 4|PE2| c. |PE1| < 2|PE2| d. |PE1| > 2|PE2| but is not equal to 4|PE2|
In the Northern Hemisphere, cyclones rotate ________; whereas an anticyclone rotates ________
A) counterclockwise around a low pressure center; clockwise around a high pressure center B) clockwise around a low pressure center; counterclockwise around a high pressure center C) counterclockwise around a high pressure center; clockwise around a low pressure center
The reverse of the respiration reaction is the reaction known as
A) combustion. B) oxidation. C) photo-synthesis. D) inhaling. E) exhaling.