When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. This pair production is an example of
a. time dilation
b. length contraction
c. the equivalence of mass and energy
d. the principle of relativity
e. none of the above
C
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A 120-V rms signal at 60.0 Hz is applied across a series combination of a 30.0-mH inductor and a resistor. If the rms value of the current in this circuit is 0.600 A, what is the resistance of the resistor?
A) 200 ? B) 143 ? C) 80.0 ? D) 30.0 ? E) 268 ?
Projectile Motion: A projectile is thrown upward at 24° with the vertical and returns to the horizontal ground 12.5 s later with no air drag.(a) How fast was it thrown?(b) How far from its original position did it land?(c) How high above its original position did it go?
What will be an ideal response?
Where would you expect to isolate molecules in a fractionating tower that have a large number of interatomic forces?
A) near the bottom B) near the top C) near the middle D) Fractional distillation takes advantage of molecular weight. E) Fractional distillation takes advantage of the number of isomers.
Answer the following statement(s) true (T) or false (F)
1. There is an electric field in the bar’s rest frame.
2. There is a magnetic field in the bar’s rest frame.