Answer:
4. Energy can be created and destroyed
Explanation:
Reason being it tells you a part of the definition of energy while all the other answers tell you why the sun is not the only source of energy.
Answer:
The current would you need flowing through the loop is
Explanation:
The magnetic moment is permanent, the area is equal to:
The current is:
Replacing the area value, the current is:
Answer:
Sometimes you can see light from the Sun passing through clouds and the sunbeams appear as straight lines. After light has been reflected off an object, such as a tree or a book, it still travels in straight lines, but in a new direction.
Explanation:
Flames melt the wax which is a physical change. The wax goes from solid to a liquid but it is still wax just going in different forms when it cools. When wax burns the wax combines with oxygen to form CO2, Carbon Monoxide, Carbon particles, (incomplete burning/oxidation) and water. The burning has broken the bonds in the wax and made a new compound.
Answer:
They appear to recede from our viewpoint.
That is, their emitted spectra are shifted toward the red (red-shift).
The wave-lengths that are received on earth are somewhat longer because of the "Doppler" shift of the receding atoms.