A hollow conducting spherical shell of radius 1.50 cm carries a charge of 5.20 nC. What is the electric field at a distance of 1.20 cm from the center of the shell?
a. 
b. 
c. 
d. 0 N/C
e. 
f. 
g. 
d. 0 N/C
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Suppose a photon has a frequency of 300 million hertz (300 megahertz). What is its wavelength?
A) 1 meter B) 1/300,000 meter C) 300 million meters D) A photon's wavelength cannot be determined from its frequency.
At the same moment, one rock is dropped and one is thrown downward with an initial velocity of from the top of a building that is 300 m tall. How much earlier does the thrown rock strike the ground? Neglect air resistance
What will be an ideal response?
Spiral arms appear bright because ________
A) they contain far more stars than other parts of the galactic disk B) they are the only places where we find stars within the disk of the galaxy C) they contain more molecular clouds than other parts of the disk D) they contain more hot young stars than other parts of the disk
A heavy rock and a light rock in free fall have the same acceleration because the
A) force due to gravity is the same on each. B) air resistance is always zero in free fall. C) inertia of each is the same. D) ratio of force to mass is the same. E) none of the above