The Sidereal Day is 4 minutes shorter than the Mean Solar Day, because the rotation of the Earth on its axis, and the orbiting of the Earth around the Sun, are both counterclockwise, as viewed from above (or north of) the Ecliptic Plane. See planetary retrograde motion for an example of the opposite situation.
The reason that the Solar Day varies around the Mean Solar Day is that the Earth moves at different speeds through its orbit around the Sun. This is in keeping with Kepler's Second Law of Planetary Motion.
Please note that the Mean Solar Day changes over a long period of time, due to the slowing of the rotation of the Earth due to tidal forces exerted on the Earth primarily by the Moon. For example, the Mean Solar Day was about 23 hours about 250 million years ago.
The control group is a group of test subjects to which the independent variable is not applied. In other words, as a scientist, you would use the independent variable on all of the different study groups except for the control group. This is done for the exact purpose stated in the question: as a standard of comparison to evaluate the effect of the independent variable.
Example: you're testing to see if adding chili to a plant makes it grow faster. You will have two plants to test on. On ONE of them, you put the chili on (to see how the chili effects it). On the OTHER one, you DO NOT put the chili on (because you need the results of a regular plant to compare with the chilified plant). The plant without the chili is the control group.
Explanation:
Answer: Explanation: A will have more pressure in its base and B will have pressure half of A if they are kept in same place. ... B will have more liquid pressure because the density of the salty water is greater than the water.Oct 13, 2020
Answer:
body breaks down both the same way balance is key
