How do we determine the age of an oil deposit?
a. By measuring the amount of uranium that has not decayed into lead.
b. By measuring its ratio of carbon-14 to carbon-12.
c. By exposing the sample to cosmic rays in the environment to produce carbon-14.
d. By calculating the amount of lead that has decayed from uranium.
e. By calculating the amount of carbon that has decayed into nitrogen.
b
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A copper wire of length 5.0 m, cross sectional area 6.9 × 10^?6 m2, and Young's modulus 11 × 10^10 N/m2 has a 190-kg load hung on it. What is its increase in length? (g = 9.8 m/s2)
a. 5.0E–3 m b. 1.8E–2 m c. 7.3E–3 m d. 1.2E–2 m e. 2.5E–2 m
200 J of work is done in compressing a gas adiabatically. What is the change in internal energy of the gas?
A) zero B) 100 J C) 150 J D) 200 J E) There is not enough information to determine.
Which of the following is not considered a potential solution to the question of why we lack any evidence of a galactic civilization?
A) The galactic civilization is deliberately avoiding contact with us. B) There is no galactic civilization because we are the first species ever to achieve the ability to study the universe. C) There is no galactic civilization because all civilizations destroy themselves before they achieve the ability to colonize the galaxy. D) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know.
When should we next expect to observe a transit of the Sun by Mars?
A) Never B) 2035 C) 2030 D) 2148