If the spiral density wave were the only thing producing spiral arms, it would be expected that
a. all spiral arms would be gas and dust free.
b. all galaxies would have only two smooth spiral arms.
c. the Milky Way would show and irregular pattern of short arms
d. the Milky Way wouldn't have any spiral arms.
e. the halo component of the Milky Way would show spiral arms as well.
B
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The equivalent capacitance of the circuit shown below is
A. 0.2 C. B. 0.4 C. C. 1 C. D. 4 C. E. 5 C.
A chicken is running in a circular path with an angular speed of 1.52 rad/s. How long does it take the chicken to complete one revolution?
A) 4.13 s B) 2.07 s C) 118 s D) 4.77 s E) 8.26 s
A thin spherical metal shell of radius 8.0 cm carries 7.5 µC of excess charge. What is the magnitude of the electric field it produces at the following places?
(k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) (a) at 1.0 cm above the surface (b) at 7.0 cm from the center of the sphere
Two point charges each have a value of 30.0 mC and are separated by a distance of 3.00 cm. What is the electric field midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 40.5 × 10^7 N/C c. zero b. 20.3 × 10^7 N/C d. 10.1 × 10^7 N/C