Measuring the amount of deuterium in the universe allows us to set a limit on
A) the density of ordinary (baryonic) matter in the universe.
B) the temperature of the universe at the end of the era of nuclei.
C) the total amount of mass in the universe.
D) the expansion rate of the universe.
E) the current age of the universe.
A
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A car with a radio antenna 1.0 m long travels at 80 km/h in a locality where the Earth's magnetic field is 5.0 × 10^?5 T. What is the maximum possible emf induced in the antenna as a result of moving through the Earth's magnetic field?
In the Southern Hemisphere, the direction of Ekman transport is
A) at a 45° angle from the wind direction. B) parallel to the wind direction. C) to the right of the wind direction. D) to the left of the wind direction.
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