In a certain particle accelerator, a proton has a kinetic energy that is equal to its rest energy. What is the speed of the proton relative to the accelerator?
A) 0.25c
B) 0.50c
C) 0.71c
D) 0.75c
E) 0.87c
Answer: E
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If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A) 2.3 × 107 m/s B) 1.9 × 107 m/s C) 1.5 × 107 m/s D) 1.1 × 107 m/s
Why isn't the Sun shrinking or expanding at present?
A) because the Sun has lived for billions of years B) Because the Sun is spinning so fast, the centrifugal forces keep the surface of the Sun supported against collapse. C) because gas pressure balances gravity in the Sun D) because the Sun is a solid substance
All stars spend approximately the same amount of time on the main sequence
Indicate whether the statement is true or false
A series RLC circuit has a 100-? resistor, a 0.100-?F capacitor, and a 2.00-mH inductor connected across a 120-V rms ac source operating at resonant frequency. What is the rms value of the voltage across the capacitor?
A) 54.0 V B) 120 V C) 150 V D) 533 V E) 170 V