Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 10^7 m/s?
a. 5.8 kV
b. 2.6 kV
c. 7.1 kV
d. 8.6 kV
e. 5.1 kV
B
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Which stellar population has highly elliptical orbits?
a. Pop I extreme b. Pop I intermediate c. Pop II intermediate d. Pop II extreme
Tensile Stress and Strain: Which of the following are SI units of Young's modulus? (There could be more than one correct choice.)
A. N/m ? s2 B. kg/m2 C. kg ? m/s2 D. kg/m ? s2 E. kg ? m2/s2
The most important reason an object is observed to be shorter in a frame where it is moving than in a frame where it is at rest is that
A. The force of motion strongly compresses an object that is moving at relativistic speeds. B. “Simultaneity” is not a frame-independent concept. C. The measuring sticks used by the moving observer are Lorentz-contracted. D. The clocks used by the moving observer run slower.
The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force on the electron due to the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 2.9 nN B) 1000 C C) 3.7 nN D) 6.8 nN E) 9.2 nN