A quarter is dropped down a hollow metal pipe and falls out the bottom T seconds later. A magnet is then dropped down the same pipe and falls out the bottom t seconds later. Which of the following is true?
A. t = T
B. t > T
C. t < T
B. t > T
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According to our present theory of solar system formation, which of the following lists the major ingredients of the solar nebula in order from the most abundant to the least abundant?
A) hydrogen and helium gas; hydrogen compounds; rock; metal B) hydrogen compounds; hydrogen and helium gas; metal; rock C) hydrogen and helium gas; rock; metal; and hydrogen compounds D) hydrogen; water; methane; and helium
What happens when the gravity of a massive star is able to overcome neutron degeneracy pressure?
A) Gravity is not able to overcome neutron degeneracy pressure. B) The core contracts and becomes a black hole. C) The core contracts and becomes a white dwarf. D) The star explodes violently, leaving nothing behind. E) The core contracts and becomes a ball of neutrons.
If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N • m2/C2, mel = 9.11 × 10-31 kg)
A) 5.9 × 107 m/s B) 4.9 × 107 m/s C) 3.9 × 107 m/s D) 2.9 × 107 m/s
A charged particle is moving perpendicular to a uniform magnetic field. The radius of its path can be decreased most by
1.decreasing the magnitude of the magnetic field. 2.increasing its velocity. 3.decreasing its velocity and increasing the magnitude of the magnetic field. 4.increasing its velocity and decreasing the magnitude of the magnetic field.