The attraction between Earth and Sydney is equal to her weight. The reaction to Earth's pull on Sydney is
A) Sydney pushing against Earth's surface.
B) the support of Earth's surface on Sydney.
C) Sydney's pull on Earth.
D) none of the above
Answer: C
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When an electron drops from a higher energy level to a lower one, energy is emitted. In comparison, how much energy is required to reverse the process, going from the lower level to the higher level?
A) less energy B) the same energy C) more energy
If a certain resistor obeys Ohm's law, its resistance will change:
a. as the voltage across the resistor changes. b. as the current through the resistor changes. c. as the energy given off by the electrons in their collisions changes. d. none of the above, since resistance is a constant for the given resistor.
The percentage composition by mass of water is approximately
a. 2% H and 1% O. b. 11% H and 89% O. c. 1% H and 99% O. d. 2% H and 16% O.
pH measures
What will be an ideal response?