The Sun's composition by the % of mass is 71% ________, 27% ________, and 2% ________.
A. hydrogen; helium; other elements
B. helium; hydrogen; other elements
C. nitrogen; oxygen; argon
D. hydrogen; helium; carbon
Answer: A
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How is Olbers's paradox explained?
What will be an ideal response?
Orion is visible on winter evenings but not summer evenings because of
A) the location of Earth in its orbit. B) baseball on television. C) interference from the full moon. D) the precession of Earth's axis. E) the tilt of Earth's axis.
A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery
(a) the voltage across the capacitor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.
A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path?
a. 15 mm b. 12 mm c. 18 mm d. 24 mm e. 8.5 mm