A cubic container 20 cm on a side is filled with water. What is the mass of the water?
8 kg
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For a white dwarf to explode entirely as a Type I supernova, its mass must be:
A) at least 0.08 solar masses. B) 1.4 solar masses, the Chandrasekhar Limit. C) 3 solar masses, the Schwartzschild Limit. D) 20 solar masses, the Hubble Limit. E) 100 solar masses, the most massive known stars.
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
A. 4.1 cm B. 2.9 cm C. 3.4 cm D. 5.1 cm E. 2.4 cm
Free Fall: A ball is thrown straight upward from ground level with a speed of 18 m/s. How much time passes before the ball strikes the ground if we disregard air resistance?
A. 3.7 s B. 1.8 s C. 1.1 s D. 0.6 s
An index of refraction less than one for a medium would imply
A) that the speed of light in the medium is the same as the speed of light in vacuum. B) that the speed of light in the medium is greater than the speed of light in vacuum. C) that the speed of light in the medium is less than the speed of light in vacuum. D) refraction is not possible. E) reflection is not possible.