The triple-alpha process
a. controls the pulsations in Cepheid variable stars.
b. is the nuclear fusion of hydrogen to helium in massive stars.
c. is the process that produces the neutrinos we receive from the Sun.
d. requires a temperature of about 5,000,000 K to operate.
e. occurs during helium flash.
e
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The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. According to this equation, if the distance between two objects increases, what happens to the gravitational force between them?
A) The force increases. B) The force decreases. C) The force drops instantly to zero. D) The gravitational force is not affected by distance.
Which of the following is not a characteristic of the 11-year sunspot cycle?
A) The sunspot cycle is very steady, so that each 11-year cycle is nearly identical to every other 11-year cycle. B) The likelihood of seeing solar prominences or solar flares is higher when sunspots are more common and lower when they are less common. C) The Sun's entire magnetic field flip-flops at the end of each cycle (at solar minimum). D) The number of sunspots on the Sun at any one time gradually rises and falls, with an average of 11 years between the times when sunspots are most numerous.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4 sin (5x) cos (6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves?
a. 3 Hz b. 1 Hz c. 6 Hz d. 12 Hz e. 5 Hz
1.8 ?F and 3.6 ?F capacitors are connected in series and then charged by a 24. volt battery. The battery and capacitors are disconnected and the capacitors reconnected in parallel (plus to plus, minus to minus)
(a) What charge initially flowed from the battery to the series combination? (b) What total charge is on the final positive plates? (c) What final voltage is across the parallel combination?