Deuterium abundance suggests that normal matter makes up only 3-4% of the critical density
Indicate whether the statement is true or false
TRUE
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The point along a planet's orbit where it is closest to the Sun is called the orbit's
A) period. B) perihelion. C) eccentricity. D) semi-major axis. E) aphelion.
Why do we believe there is dark matter?
What will be an ideal response?
Consider some material that has been cooled until it has become a superconductor. If it is cooled even further its resistance will:
a. stay constant and non-zero. c. decrease. b. increase. d. None of these choices.
A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
A. 0.15 N B. 0.68 N C. 0.30 N D. 0.34 N E. 0.10 N