Answer:
D. The primary source, because it was written by the researcher
Explanation:
One should learn to trust the primary source more because it is the real work of the researcher.
A primary work defines the work of research from his or her experimental findings.
- The primary source presents experimental data and other subordinates ones to reach a conclusion as seen from the view of the researcher.
- A secondary source implies someone else documenting their own opinion about the primary experimental set up.
- This can get dicey in the sense that results can be twisted to serve other ulterior motives.
Answer:
The number of coils of the wire and the strength of the power source.
Explanation:
It is a direct relationship meaning when one increases so does the other. A stronger power source will induce a stronger magnetic force. The more coils the stronger the magnet.
Answer:
The net forces exerted on the horse and cart are not the same, so they are not balanced forces.
Explanation:
Using newton laws,
ΣF = ma
The two forces acting on the body is the forward force by the horse and the frictional force opposing the forward force
F-Fr= ma
Therefore,
F=ma+Fr
So the forward (by horse) is more than the opposite reaction (by cart).
The only time the forward force and the opposite reaction are the same is when a=0, I.e, the body is not moving at all or the body is moving at constant velocity.
Answer:
The statement about atmospheric pressure that is false is <u><em>option d) With an increase in altitude, atmospheric pressure increases as well. </em></u>
Explanation:
Atmospheric pressure as the force exerted by atmospheric air on the earth's surface. The higher the height of the earth's surface with respect to sea level, which is the reference point, the lower the air pressure. In other words, atmospheric pressure decreases in altitude. This is because, the higher the height, the smaller the amount of air present for pressure. For example, on a mountain the amount of air in the highest part is less than that on a beach. This means that there is lower atmospheric pressure at the top.
Although it must be taken into account that the atmospheric pressure does not decrease proportionally in height, due to the high compressibility of the fluid (gas).
At sea level, which is the reference point, atmospheric pressure takes a value in different units of 1 atmosphere, 1013 millibars or 760 mm Hg.
So, <u><em>the statement about atmospheric pressure that is false is option d) With an increase in altitude, atmospheric pressure increases as well.</em></u> This is because, as mentioned, with an increase in altitude, the atmospheric pressure decreases.
