The theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula.
b. laboratory measurements of the mass of the neutrino.
c. the brightening of supernovae a few days after they are first visible.
d. underground counts from solar neutrinos.
e. the detection of neutrinos from the supernova of 1987.
e
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At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. They coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point
Thermosetting polymers are more brittle than thermoplastic polymers, because the long-chain molecules are _____________.
Fill in the blank(s) with the appropriate word(s).
The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the new resistance of this wire?
A) It is 2 times as large. B) It is 4 times as large. C) It is 6 times as large. D) It it 8 times as large. E) It is ½ as large.
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the initial decay rate, at t = 0 (in decays/s)?
a. 1.09 × 10^14 b. 1.8 × 10^?9 c. 5.6 × 10^8 d. 3.6 × 10^18 e. 3.6 × 10^17