Which color of visible light carries the most energy per photon (light particle)?
A) blue
B) green
C) red
D) violet
E) all the same
Answer: D) violet
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A 60 kg boy standing on a skateboard with frictionless wheels and negligible mass throws a 3 kg ball straight up with a speed of 4 m/s. If the boy was at rest before the throw, his speed after the throw will be ________.
Fill in the blank(s) with the appropriate word(s).
What observation of extrasolar planetary systems provides strong confirmation of the condensation theory?
What will be an ideal response?
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide and 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
If the induced current in a wire loop were such that the flux it produces is in the same direction as the change in external flux causing the current, which of the following conservation laws would end up being violated?
a. energy c. momentum b. charge d. angular momentum