The presence of which rocks show that between 2 and 3 billion years ago the atmosphere contained less than 1% of the amount of oxygen it contains today?
A) limestone
B) banded iron formations
C) silicate clays
D) sandstone
B
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Explain Mercury's peculiar rotation and revolution. How is it different than most other planets?
What will be an ideal response?
More than 2000 years ago, Hipparchus compared the positions of some stars with their positions recorded nearly two centuries previously and realized that:
A) the celestial poles and equator remained stationery. B) the celestial poles and equator were slowly moving across the sky. C) the stars were moving closer to each other. D) the stars were moving across the sky randomly.
Self-Inductance: A coil with a self-inductance of 6.0 H is connected to a dc battery through a switch. As soon as the switch is closed, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at this instant?
A. 6.0 V B. 3.0 V C. 12 V D. 0.33 V E. 0.0 V
Which of the following normally warms up fastest when heat is applied?
A) water B) iron C) glass D) wood E) all of the above