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 x 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
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An air sample is contaminated with 15O, which has a half-life of 2.03 min. One possible way to minimize its hazard is to pass it through a long pipe to allow it to decay inside the pipe until it can be safely released into the atmosphere
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An Earth observer sees a spaceship at an altitude of 920 m moving downward toward the Earth at a speed of 0.690c. What is the spaceship's altitude as measured by an observer in the spaceship?
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