While most neutron stars are also pulsars, an older "bare" neutron star was captured in rapid motion only 200 lightly years distant by:
A) Arecibo Radio Observatory.
B) the Keck Telescopes used as an interferometer.
C) the Chandra X-ray observatory.
D) the Hubble Space Telescope.
E) the Spitzer Infrared Space Telescope.
D
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"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)
What will be an ideal response?
The probability of Earth being hit by a 10 km asteroid in the next few hundred million years is
A) almost certain B) impossible to predict C) zero D) small but not zero
The three principal sources of the internal heat of terrestrial planets are
A) accretion, differentiation, and eruption. B) accretion, differentiation, and radioactivity. C) convection, differentiation, and eruption. D) conduction, convection, and eruption. E) conduction, differentiation, and accretion.
A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3 . What is the magnitude of the potential difference between the center and a point 4.0 cm away?
a. 12 V b. 6.8 V c. 3.0 V d. 4.7 V e. 2.2 V