An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2 To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom
If the depth of the crater is 120 m, how long does it take for the rock to fall? A) 3.04 s
B) 12.2 s
C) 29.3 s
D) 32.1 s
E) 37.5 s
B
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_____ consists of chemical processes involving natural selection of complex molecules prior to the origin of life
A) Chemical engineering B) Chemical synthesis C) Chemical treatment D) Chemical evolution
Terminal Voltage and Internal Resistance: A battery has an emf ? = 12 V and an internal resistance r = 2.0 ?, as shown in the figure. When a 3.0-? cable is connected across the battery terminals a and b, the rate at which chemical energy in the battery is depleted is closest to
A. 24 W. B. 27 W. C. 29 W. D. 32 W. E. 34 W.
Which statement best describes what was called the solar neutrino problem?
A) Early experiments designed to detect solar neutrinos found them, but in fewer numbers than had been expected. B) It referred to the fact that neutrinos are extremely difficult to detect. C) Our understanding of fusion in the Sun suggested that neutrinos should be destroyed before they arrive at Earth, yet neutrinos were being detected. D) No one understood how it could be possible for neutrinos to be produced in the Sun.
At the start of which eon of Earth's history do we find the earliest evidence of life?
A) Phanerozoic B) Proterozoic C) Archean D) Hadean