Which one of the following could be a correct value for a right ascension measurement?
a) 80°E
b) 10°N
c) +30°
d) 16 hours, 20 minutes
d
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A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 106 m?
A) 0.15 × 10-2 s B) 15 ms C) 6.7 × 10-2 s D) 20 ms E) 25 ms
An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
a. 2.2 m/s2 b. 2.7 m/s2 c. 3.3 m/s2 d. 3.8 m/s2 e. 4.4 m/s2
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.
Simple Harmonic Motion: If we double the frequency of a system undergoing simple harmonic motion, which of the following statements about that system are true? (There could be more than one correct choice.)
A. The period is doubled. B. The angular frequency is doubled. C. The amplitude is doubled. D. The period is reduced to one-half of what it was. E. The angular frequency is reduced to one-half of what it was.