Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of -12 nC/m2 . Determine the magnitude of the electric field at a point 2.0 cm from the symmetry axis of the two surfaces
a. 2.3 kN/C
b. 1.1 kN/C
c. 1.7 kN/C
d. 3.4 kN/C
e. 4.5 kN/C
B
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A. unchanged. B. half as great. C. one-fourth as great. D. twice as great.
Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, assuming negligible air resistance?
A) at least 3.0 cm B) at least 4.9 cm C) at least 6.8 cm D) at least 9.8 cm
A 2500 kg car accelerates up to a velocity of 30.0 m/s in 8.00 seconds. The work done by the engine to accelerate the car is
A. 
B. 
C. 
D. 
E. 
Total Internal Reflection: A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33.
Fill in the blank(s) with the appropriate word(s).