Which spectrum is shown above?
a. emission
b. absorption
c. continuous
d. blackbody
B
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Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A. 50 V. B. 100 V. C. 200 V. D. none of the given answers.
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg • m2. If the arms are pulled in so the moment of inertia decreases to 1.80 kg • m2, what is the final angular speed?
A) 2.25 rad/s B) 4.60 rad/s C) 6.25 rad/s D) 1.76 rad/s E) 0.810 rad/s
A substance of unknown composition is heated in an open container. As a result, the mass of the container and its contents
a. decreases. b. remains the same. c. increases. d. Any of these could occur.
In radioactive decay, the changed nucleus after decay is referred to as the
A) daughter isotope B) parent isotope C) mother-in-law isotope D) progenitor isotope