Resistance and Resistivity: Which one of the following quantities is equivalent to 1 ??
A. 1 J/s
B. 1 W/A
C. 1 V ? A
D. 1 V/A
E. 1 A ? s
Answer: D
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Why can studies of carbon isotopes be used to detect the presence of past biological activity in rocks?
A) living organisms absorb only the most common carbon isotope B) living organisms remove all carbon from rocks C) living organisms absorb certain carbon isotopes more easily than others D) carbon isotopes are found only in living organisms
The coil of a generator is rotated twice as fast keeping all other factors constant. What happens to the value of the maximum induced emf?
A) It stays the same. B) It is reduced by a factor of 2. C) It is increased by a factor of 2. D) It is increased by a factor of 4. E) It is reduced by a factor of 4.
Most galaxies are isolated in space
Indicate whether the statement is true or false
Three objects of masses 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass of this system?
A) (1.3 m, 0.67 m) B) (1.3 m, -0.67 m) C) (-1.3 m, 0.67 m) D) (-1.3 m, -0.67 m)