The internal activity of Mars is responsible for its ________.
A. 4,000-km long rift valley, Valles Marineris
B. magnetic field
C. lack of an atmosphere
D. slow rotation
Answer: A
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If you measure the distance between two telephone poles with a steel tape on a very hot day, your measured distance will be
A) a bit short. B) a bit long. C) the same as on an average-temperature day.
Identify the correct sequence of life events for a high mass star
A) red supergiant, main sequence, neutron star, supernova B) red supergiant, main sequence, supernova, neutron star C) main sequence, red supergiant, supernova, neutron star D) main sequence, red supergiant, neutron star, supernova
Transformers: A transformer is a device used to
A. transform an alternating current into a direct current. B. transform a direct current into an alternating current. C. increase or decrease an ac voltage. D. increase or decrease a dc voltage.
Sound waves of a certain frequency in air having a wavelength of 1.9 m will have what wavelength in water? Take the speed of sound in air to be 340 m/s and in water to be 1 490 m/s
a. 0.57 m b. 1.9 m c. 8.3 m d. 11 m