Which of the following statements about the first stars that were born in the universe is expected to be true?
A) They were made only from hydrogen and helium.
B) They were made from pure energy.
C) They were probably orbited only by terrestrial planets but no jovian planets.
D) They were made approximately of 98% hydrogen and helium and 2% of heavier elements.
A) They were made only from hydrogen and helium.
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All nuclei of a given element have the same number of
A) neutrons. B) protons. C) nucleons. D) protons + neutrons.
The unsaturated zone of soil or rock above the water table is called the zone of ______________
Fill in the blank(s) with correct word
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2 . If an electric field of 2.0 × 10^6 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
It takes 10 J of work to push a charge into an electric field. Relative to its starting position it has gained a potential energy of
A) less than 10 J. B) 10 J. C) more than 10 J. D) none of the above