Only about three comets per year plunge into the Sun and are destroyed
a. True
b. False
Indicate whether the statement is true or false
False
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If a star has a parallax of 0.05", then its distance in light-years is about
A) 6.4 light-years. B) 12.7 light-years. C) 20 light-years. D) 65 light-years. E) 100 light-years.
A pipe of length L that is closed at one end and open at the other end is resonating at its fundamental frequency. Which statement about the sound is correct?
A) The wavelength is 4L and there is a displacement node at the pipe's open end. B) The wavelength is 4L and there is a displacement antinode at the pipe's open end. C) The wavelength is L and there is a displacement node at the pipe's open end. D) The wavelength is L and there is a displacement antinode at the pipe's open end.
Two flat conductors are placed with their inner faces separated by 6.0 mm. If the surface charge density on one of the inner faces is 40 pC/m2, what is the magnitude of the electric potential differences between the two conductors?
a. 36 mV b. 18 mV c. 32 mV d. 27 mV e. 14 mV
What two things are unusual about the luminosity of the core of a Seyfert galaxy?
What will be an ideal response?