For a solid angle of 0.2 steradians, what is the surface area enclosed at a distance of 4 m from the source?
What will be an ideal response?
You might also like to view...
Our Moon in Earth orbit travels fastest when it is
A) involved in an eclipse. B) rotating. C) revolving. D) closest. E) all of the above
You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is
A) speeding up. B) slowing down. C) changing direction. D) speeding up and changing direction. E) slowing down and changing direction.
How fast would a rocket ship have to move to contract to half of its proper length (as observed by a stationary object)?
A) 0.25c B) 0.50c C) 0.65c D) 0.78c E) 0.87c
Force on a Wire: If a calculated quantity has units of 
, that quantity could be
A. an electric field. B. an electric potential. C. ?0. D. a magnetic field. E. a magnetic torque.