An alpha particle (m = 6.7 × 10^?27 kg, q = +3.2 × 10^?19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA ? VB
a. +4.2 V
b. ?4.2 V
c. ?9.4 V
d. +9.4 V
e. ?8.4 V
b
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Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.
Latent Heats: If you add 1.33 MJ of heat to 500 g of water at 50°C in a sealed container, what is the final temperature of the steam? The latent heat of vaporization of water is 22.6 × 105 J/kg, the specific heat of steam is 2010 J/kg ? K, and the specific heat of water is 4186 J/kg ? K.
A. 100°C B. 112°C C. 123°C D. 147°C E. 195°C
The Kuiper Belt is at a distance of about 30 AU from the Sun
Indicate whether the statement is true or false
When a blinking light source moves relative to you, the speed of the light
A) changes but the frequency of blinks remains constant. B) remains constant but the frequency of blinks can change. C) stays the same, as does the blinking frequency.