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What is the best example of the purpose of scientific notation?
Any number that is very large, or very small (near zero). For example, the mass of the Sun in kilograms (large), the distance to the M31 galaxy in meters (large), or the mass of the electron in kilograms (small).
How many electron volts per kilowatt hour?
One kWh has 2.25 x 1025 eV. (The electron-volt is a very small unit, used in particle physics.)
When you cut an apple into pieces does its mass stay the same or does it get smaller?
Its mass remains the same (except for the very small amounts that stick to the knife blade).
Does the period of simple pendulum depend on the mass of the bob?
Not in the theoretical world, in the practical world: just a very little. The period is determined primarily by the length of the pendulum. If the rod is not a very small fraction of the mass of the bob then the mass center of the rod will have to be taken into account when calculating the "length" of the pendulum.
What are defects of e equals mc2?
The formula E=mc2 states that the conversion ratio of mass to energy is "Energy=mass times the speed of light squared" (which indicates that the conversion of a small amount of mass can create a very large amount of energy).
