The polar caps on Mars are composed of
A) frozen carbon dioxide only.
B) water ice only.
C) both frozen carbon dioxide and water ice.
D) frozen hydrogen.
E) salt deposits.
C) both frozen carbon dioxide and water ice.
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Transverse waves are traveling on a 1.00-m-long piano string at 500 m/s. If the points of zero vibration occur at one-half wavelength (where the string is fastened at both ends), find the frequency of vibration.
A. 250 Hz B. 500 Hz C. 1000 Hz D. 2000 Hz E. 2500 Hz
Both electrons and protons have equal-magnitude
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