The tail of a comet is primarily caused by
A) radiation pressure.
B) electromagnetic induction.
C) Coulomb repulsion.
D) eddy currents.
E) nuclear magnetism.
A
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What are X-ray bursters?
A) They are the central sources of energy for planetary nebulae. B) They are very massive stars that explode as supernovae, emitting bursts of X- rays and gamma-rays in the process. C) They are rapidly rotating black holes whose precession points their poles toward us on occasion. D) They are violent energy sources known to lie at the heart of the Milky Way and similar massive galaxies. E) They are neutron stars on which accreted matter builds up, then explodes in a violent nuclear explosion.
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26 s-1)t]. What is the speed of the mass when t = 0.805 s?
A) - 13.2 cm/s B) 13.2 cm/s C) 8.19 cm/s D) - 8.19 cm/s E) 0 cm/s
He discovered what we now call Newton's first law of motion
A) Copernicus B) Galileo C) Ptolemy D) Tycho Brahe E) Kepler
The symbol indicating the number of neutrons in a nucleus is __________
Fill in the blank(s) with correct word