A small glass bead has been charged to 8.0 nC. What is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 3.6 × 10-6 N/C B) 1.4 × 10-3 N/C C) 1.8 × 105 N/C D) 3.6 × 103 N/C
C
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A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin
The disk carries a total charge of +3.00 ?C distributed uniformly over its surface. Calculate the magnitude of the electric field due to the disk at the point x = 15.0 cm along the x-axis. (?0 = 8.85 × 10-12 C2/N ? m2) A) 9.95 × 105 N/C B) 4.98 × 105 N/C C) 3.31 × 105 N/C D) 2.49 × 105 N/C E) 1.99 × 105 N/C
Water pressurized to 3.5 × 105 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?
A. 2.5 × 105 Pa, 15 m/s B. 3.0 × 105 Pa, 10 m/s C. 3.0 × 105 Pa, 15 m/s D. 4.5 × 105 Pa, 1.5 m/s E. 5.5 × 105 Pa, 1.5 m/s
An ideal gas undergoes an adiabatic process while -25 J of work is done on it. What is the change in the internal (thermal) energy of the gas?
A) 0 J B) 25 J C) -25 J D) 50 J E) -50 J
Asteroids ________.
A. are about the same size as planets, but have not pulled themselves into a spherical shape B. are small bodies, typically the size of a grain of sand or a boulder C. are larger objects, a few hundred kilometers in size, but not quite large enough to be classified as a planet D. can range in size from a few meters to many hundreds of kilometers