The most recent time that water appears to have flowed on Mars, if only briefly, is during the
A) Amazonian Era
B) Hadean Era
C) Noachian Era
D) Hesperian Era
A
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If an average hydrogen atom in Earth's atmosphere has a velocity of 2.5 km/s, what would be the average velocity of an oxygen molecule in Earth's atmosphere? Note that the atomic mass of an oxygen atom is 16 times that of a hydrogen atom.
a. 0.16 km/s b. 2.5 km/s c. 0.62 km/s d. 0.44 km/s e. 0.25 km/s
A simple machine cannot multiply
A) force. B) distance. C) energy. D) none of the above
A Styrofoam ice chest is 2 cm thick. If the inside of the chest is at 0ºC and outside the chest it is 25ºC, estimate the heat transfer by conduction through the Styrofoam per unit area.
What will be an ideal response?
Newton's Second Law in 1 Dimension: A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s. What magnitude force does a 68.0 kg passenger experience during the acceleration?
A. 394 N B. 82.0 N C. 342 N D. 311 N