He would have to push on it creating a torque that causes angular velocity of the merry go round to change.
Primary Source because the primary come from the person who actually live through what they wrote.
And secondary comes from the primary source but they might change stuff so that’s why it is not reliable.
I think Lady Macbeth wasn't involved at all because Macbeth does not tell her. Also, Macbeth does not want to keep her worried. So Macbeth says "Be innocent of the knowledge, dearest chuck, / Till thou applaud the deed.". This means that Macbeth is telling Lady Macbeth to digest the deed about Duncan first. This is what i remember its been a while since i read the book. But hope this helps.
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An example of proactive is a student studying for a fall semester class during their summer vacation. Acting in advance to deal with an expected change or difficulty. We can deal with each problem as it pops up, or we can take a proactive stance and try to prevent future problems.
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hope this helped ;)