At approximately what temperature does water have its greatest density?
a. 4°C
b. 100°C
c. 0°C
d. None of these; the density of water is constant at all temperatures.
a
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Weight and g: The earth has radius R. A satellite of mass 100 kg is in orbit at an altitude of 3R above the earth's surface. What is the satellite's weight at the altitude of its orbit?
A. 61 N B. 110 N C. 9000 N D. 16,000 N
The best evidence for the existence of supermassive black holes is
A) very high orbital velocities in a very compact region. B) evidence for jet velocities that approach the speed of light. C) large quantities of high-energy emission such as X-rays and gamma rays, and radio emission from relativistic electrons. D) huge dark regions in the centers of galaxies, where black holes have been sucking in the galaxy from the inside out.
Although low luminosity stars are very common, the probability of individual stars having planets within their habitable zones is low because low luminosity stars
A) are not expected to form rocky, terrestrial planets B) have very narrow habitable zones C) have no habitable zones at all D) are very unstable
Where groundwater discharges to a swamp, the elevation of the water table next to the swamp is
A) lower than the surface of the swamp. B) at the same elevation as the surface of the swamp. C) slightly higher than the surface of the swamp. D) Not enough information is given.