A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s
b. 0.63 s
c. 0.69 s
d. 0.59 s
e. 0.47 s
C
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How many electrons does it take to fill the d subshell?
A) 10 B) 6 C) 14 D) 2 E) 4 F) 8
Suppose you start at Washington, D.C. (39°N, 77°W), and travel 400 nautical miles due south, then 400 nautical miles due east, then 400 nautical miles due north, and then 400 nautical miles due west. Where will you arrive with respect to Washington, D.C.? That is will you be at the starting point, or north, south, east, or west of the starting point?
electron degeneracy occurs, because?
What will be an ideal response?
Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon. b. most lie beyond dense dust clouds. c. they have only a small surface area from which to emit. d. the peak of their thermal emission is at much shorter wavelengths than visual. e. they have only a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual.