Answer:
C. The poster provides an emotional picture of a young, innocent girl with a slightly worried expression to make protective feelings.
Explanation:
The girl looks quite worried in the poster. Attached is the image:
Consider the Earth as a sphere. Think of the atmosphere as having a height of say about 20000 m. The volume of a sphere is 4/3 * pi * r ^3.
Find the volume of a sphere of radius 6020000 m and subtract the volume of the Earth which is a sphere of radius 6000000 m (approx).
This would be the volume of air in m^3.
Approximate the lungs as a cube, it would be approx 0.2m x 0.2m x 0.2 m = 0.008 m^3
Divide the volume of air around the Earth by 0.008.
0.001 m^3 of air contains about 6 x 10^23 molecules which is about 12 x 10^23 atoms.
If your lungs are 0.008 m^3 then that would be about 96 x 10 ^23 or about 10^25 atoms.
Compare that number with the earlier number when dividing air in the atmosphere by 0.008.
I hope this helps. :)
The strength of the electromagnet depends directly on the
current (amps) in the wire that the coil is made out of.
That current is going to be determined by the voltage of the
battery or power supply that powers the magnet, and by the
resistance of the wire. So yes, the properties of the wire do
have a direct effect on the strength of the magnet. If you
tried to make an electromagnet with a coil of wet spaghetti,
it would work, but you would need a humongous power supply
to get any significant strength out of the magnet.
Answer:
The angular velocity is slowing down.
Explanation:
- By convention, if a rigid body is rotating clockwise, the angular velocity is negative.
- If the angular acceleration has a positive sign, since the angular acceleration and the angular velocity have opposite signs, this means that the angular velocity is slowing down.
