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

Physics & Space Science

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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

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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.

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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

Physics & Space Science

Which stellar population has highly elliptical orbits?

a. Pop I extreme b. Pop I intermediate c. Pop II intermediate d. Pop II extreme

Physics & Space Science