We have sent several spacecraft on trajectories that will ultimately take them into interstellar space (including Pioneer 10 and 11, Voyager 1 and 2, New Horizons). How long will it take these spacecraft to travel as far as the nearest stars?
A) tens of thousands of years
B) a few hundred years
C) a few decades
D) never, because they will rust and fall apart
E) about a thousand years
A) tens of thousands of years
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In what way(s) has Pluto long been known to be different from the planets?
A) Its orbit is more inclined to the ecliptic plane. B) It is composed primarily of ices. C) It is far smaller than the terrestrial planets. D) It has a highly eccentric orbit. E) All of the above
Butadiene rubber has a very low tensile strength; therefore, it is primarily used as a(n) _________.
Fill in the blank(s) with the appropriate word(s).
Which of the following does the intensity of synchrotron radiation NOT depend on?
A) mass of the electron B) temperature C) speed of electrons D) frequency of radiation E) strength of the magnetic field
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the disintegration constant (in s-1)?
a. 5.6 × 10^-2 b. 5.6 × 10^8 c. 3.2 × 10^7 d. 1.8 × 10^-9 e. 1.6 × 10^6