Consider a flat steel plate with a hole through its center as shown in Fig.17-1. When the plate's temperature is decreased, the hole will
A)
contract only if it takes up more than half the plate's surface area.
B)
expand if it takes up less than half the plate's surface area.
C)
contract.
D)
expand.
E)
remain the same size.
C
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The circuit below shows three resistors in parallel. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.
Exclusion Principle: How many electrons will fit into a 4f subshell?
A. 3 B. 4 C. 7 D. 14
Most of the elements heavier than iron that are spread throughout the dust of the universe were created
A) in hot white dwarf stars. B) during the fusion process that powers the stars, and then released in supernova explosions. C) in the original creation of the universe. D) in college cafeterias. E) during the shock of a supernova explosion.
Suppose that in a certain collection of nuclei there were initially 1024 nuclei and 20 minutes later there was only one nuclei left, the others having decayed
On the basis of this information, how many nuclei would you estimate decayed in the first 6 minutes?