52.10 Which best explains how and why scientific knowledge is continually expanded and improved?
The scientific process flows in one direction and finds only facts that support a scientist's original idea.
O The scientific process is cyclical so that new facts inspire questions that lead to new studies.
Once explanations are found to be true, they do not need to be questioned; then scientists can stop studying the
topic.
Once facts are found through experiments and observations, other scientists do not need to repeat the experiments.
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An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

Does anyone have the answers to online physics course plato course physics, semester a v3.0