The exospheres of the Moon and Mercury differ from the atmospheres of Venus, Earth and Mars in that
a. they are made of a very thin layer of carbon dioxide.
b. they are made of a thick layer of water vapor.
c. they extend much farther from the rocky surface.
d. they are made of a thin layer of light atoms such as helium, sodium, and argon.
d. they are made of a thin layer of light atoms such as helium, sodium, and argon.
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A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5 km/h. What is the magnitude of the sum of the forces exerted on the motorcycle?
A) 719 N B) 2.95 × 103 N C) 1.31 × 104 N D) 4.31 × 104 N
The lifetime of a star is dependent on its ________.
A. temperature B. mass C. volume D. luminosity
A standing wave is set up in a 200-cm string fixed at both ends. The string vibrates in 8 distinct segments when driven by a 120-Hz source. What is the wavelength?
a. 6 cm b. 13 cm c. 25 cm d. 50 cm e. 100 cm
A particle trapped in a rigid box cannot have zero energy
Indicate whether the statement is true or false