Answer:
Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than wire cables.
Explanation:
Answer: Radiation
Explanation: Radiation is the energy that comes from a source in form of electromagnetic waves, subatomic particles, light, or heat which travels through space.
Examples of radiation include the light, heat, and particles emitted from the Sun.
Using a foil barrier to prevent heat transfer is possible because foil has a silver color, and silver reflects light and heat instead of absorbing them. This is the opposite of black surfaces that absorb heat.
So in homes where these foil reflective barriers are used, the transfer of heat through Radiation is highly reduced.
Answer:
Measurement is important so we could measure certain things right. By taking measurements we can have a knowledge of sizes, lengths, widths etc.
Explanation:
Answer:
the push of the table on the book
Explanation:
There are two forces acting upon the book.
First force - the Earth's gravitational pull ( a downward force)
Second force - the push of the table on the book ( referred as a normal force) (pushes upward on the book.)
These two forces are of equal magnitude and in opposite directions (20 N)
Therefore they balance each other
The book is said to be at equilibrium state without been subjected to a acceleration