Carbon-14 is produced in the atmosphere principally by
A) plants and animals.
B) cosmic-ray bombardment.
C) nitrogen bombardment.
D) photosynthesis.
E) none of the above
Answer: B
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A violin with string length 32 cm and string density 1.5 g/cm resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open. What is the tension in the string?
A) 1000 N B) 110 N C) 450 N D) 4100 N E) 56 N
For n = 5, how many allowed values are possible for the orbital quantum number and the orbital magnetic quantum number?
a. 5, 11 c. 5, 9 b. 6, 12 d. 4, 9
A satellite of mass 500 kg orbits the earth with a period of 6,000 s. The earth has a mass of 5.97 × 1024 kg, a radius of 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
(a) Calculate the magnitude of the earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the earth's surface.
An intrinsically very bright star might appear faint if it is far away
Indicate whether the statement is true or false