A very long nonconducting cylinder of diameter 10.0 cm carries charge distributed uniformly over its surface. Each meter of length carries +5.50 µC of charge
A proton is released from rest just outside the surface. How far will it be from the SURFACE of the cylinder when its speed has reached 2550 km/s? (k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, mproton = 1.67 x 10-27 kg)
2.05 cm
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You see a waxing crescent moon. You email your friend in New Zealand and ask her what moon phase she sees that night. She says
A) waxing crescent. B) waning crescent. C) waning gibbous. D) waxing gibbous.
Neutron stars have:
A) very strong bi-polar magnetic fields. B) weak or non-existent magnetic fields. C) periods of days or weeks. D) monopolar fields that switch polarity every rotation. E) no relation to pulsars.
Which of the following are attracted by gravity?
A) antimatter B) any object with mass C) electromagnetic radiation D) neutrinos E) All of the above
Different units can be used for length: m and cm, and of these two, m is the larger by a factor of 100 . Different units can also be used for R: (1) J/mol/K, (2) L/atm/mol/K, and (3) (N/m2)/m3/mol/K. Which of these units for R is the largest? Hint: When expressing R in each of these units, which expression has the lowest numerical factor? (1 L = 10?3 m3, 1 atm = 1.01 × 10^5 Pa)
a. 1 b. 2 c. 3 d. They are all equal.