A certain metal has a coefficient of linear expansion of 2.00 × 10-5 K-1. It has been kept in a laboratory oven at 325°C for a long time. It is now removed from the oven and placed in a freezer at -145°C
After it has reached freezer temperature, the percent change in its density during this process is closest to
A) +2.90%.
B) -2.90%.
C) +2.74%.
D) -2.74%.
E) It is not possible to tell without knowing the mass and original volume of the metal.
Answer: A
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A) zero. B) 10 m/s. C) 40 m/s. D) more than 40 m/s.
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force is proportional to the magnitude of the charge of the object on which the force is exerted.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesThe quantum number that can have only two possible values is the:
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The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra
a. True b. False Indicate whether the statement is true or false