A holographic plate produces an image for the viewer that is:
A. real
B. virtual
C. may be either virtual or real
A. real
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Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?
a. 1.2E–1 years b. 1.9E+1 years c. 4.3E+0 years d. 6.3E+1 years e. 8.1E+0 years
At what altitude and in what direction in your sky does the north or south celestial pole appear?
What will be an ideal response?
Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 ?N b. 40 ?N c. 69 ?N d. 50 ?N e. 20 ?N
As the moon circles Earth, the net force on it is
A) backward. B) directed outward away from Earth. C) directed inward toward Earth. D) forward. E) zero.