The gravitational effect of the moon causes both the high tide and low tides.
Answer:
Both A and B are correct
Explanation:
- Magnetic line of force can be seen by placing iron fillings on a piece of paper and then hold a magnet over them, the iron fillings align themselves in the magnetic field of the magnetic along the line of forces thus showing the loops of the magnetic line of forces.
- Also, we know that unlike poles attract where as like poles repel each other. This fact can be proved when we hang a bar magnet it aligns itself in the North-South direction because of the the magnetic field due to the alignment of the geographical North-South poles and the poles of the bar magnet and the compass works the same way.
Thus both the technicians are correct.
<span>Magnetic field 'lines' were invented by people, to have a visualization of the
magnetic field. We draw 'lines' to show the direction of the force that a tiny
test magnet would feel if it were at any point in the field, and the direction
it would move from there.
If 'lines' crossed, then there would be a point in the field where a tiny test
magnetic would feel a force in two different directions, and it would have a
choice of which way to go from there. That doesn't happen.</span>
Answer:
![1.28 \times 10 ^{-3} m^3/s](https://tex.z-dn.net/?f=1.28%20%5Ctimes%2010%20%5E%7B-3%7D%20m%5E3%2Fs)
Explanation:
Given that the radius of the pipe, r =0.0112 m
So, the area of the cross-section, ![a= \pi (0.0112)^2 = 3.941\times 10^{-4} m^2](https://tex.z-dn.net/?f=a%3D%20%5Cpi%20%280.0112%29%5E2%20%3D%203.941%5Ctimes%2010%5E%7B-4%7D%20m%5E2)
Speed of water in the pipe, v=3.25 m/s
Volume flow rate =![av= 3.941\times 10^{-4} \times 3.25 = 1.28\times 10 ^{-3} m^3/s](https://tex.z-dn.net/?f=av%3D%203.941%5Ctimes%2010%5E%7B-4%7D%20%5Ctimes%203.25%20%3D%201.28%5Ctimes%2010%20%5E%7B-3%7D%20m%5E3%2Fs)
Hence, the volume flow rate is ![1.28 \times 10 ^{-3} m^3/s](https://tex.z-dn.net/?f=1.28%20%5Ctimes%2010%20%5E%7B-3%7D%20m%5E3%2Fs)
A pure substance.
Pure substances have both physical and chemical properties, for example, pure substances have melting points and boiling points, solubility, desnity, etc.
Have a great day, and glad I could help!