The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 3.2 × 10^7 m/s in a distance of 2.00 cm. What electric field is required? (me = 9.11 × 10^?31 kg and e = 1.60 × 10^?19 C)
a. 4.6E+4 N/C
b. 2.3E+5 N/C
c. 1.5E+5 N/C
d. 2.9E+5 N/C
e. 1.6E+4 N/C
c
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Which of the following Mars surface features provides dramatic evidence that volcanism has played a role in shaping the surface of Mars?
A. the polar caps B. the southern highlands C. Valles Marineris D. Olympus Mons
A particle confined to motion along the x axis moves with constant acceleration from x = 2.0 m to x = 8.0 m during a 2.5-s time interval. The velocity of the particle at x = 8.0 m is 2.8 m/s. What is the acceleration during this time interval?
A. 0.48 m/s2 B. 0.32 m/s2 C. 0.64 m/s2 D. 0.80 m/s2 E. 0.57 m/s2
The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A) It is increased by a factor of 2. B) It is increased by a factor of 4. C) It is reduced by a factor of 2. D) It is reduced by a factor of 4. E) It is reduced by a factor of 8.
Which is the best indication of the usefulness of a machine, the actual mechanical advantage or the theoretical mechanical advantage?