A sinusoidally varying potential difference has amplitude 170 V. What is its rms value?
1.170 V
2.120 V
3.0
4.-120 V
5.-170 V
2
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One star is three times further away than another. The parallax angle of the more distant star is:
A. nine times larger than that of the nearer star B. three times larger than that of the nearer star C. the same as that of the nearer star D. three times smaller than that of the nearer star E. nine times smaller than that of the nearer star
The deviation from the way a compass needle points from the true north direction is the magnetic declination
a. True b. False Indicate whether the statement is true or false
What positive effect have supernovae had on the development of life on Earth? a. Supernovae are the main source of background radiation needed for mutations. b. Chemical elements necessary for life can only be formed in supernovae
c. The formation of the Sun was triggered by a supernova event. d. Planets form by accretion of material in the expanding remnant of a supernova. e. Neutrino bombardment was necessary to form the first simple proteins.
One possible way that future scientists may determine whether the core-accretion model or the gravitational instability theory better explains the formation of the jovian planet is:
A) measuring the mass of the rocky material in the jovian planets' cores. B) measuring the metallic hydrogen layer in the jovian planets. C) observing the changes in the rings around the jovian planets. D) observing the changes in the magnetic fields of the jovian planets.