Compute your average velocity in the following two cases: (a) you walk 85.2 mat a speed of 2.24 m/s and then run 85.2 m at a speed of 3.73 m/s alonga straight track. (b) you walk for 1.00 min at a speed of 2.24 m/s and then run for 1.30 min at 3.73 m/s along a straight track. the position of an object moving along an x axis is given by x 3.181-4041? + 1.05 where x is in meters and in seconds. find the position of the object at the following values of (a) 15.0 2 , and (d) 4 s. (e) what is the object's displacement between 0 andt - 457 what is its average velocity from t - 2 stot - 4s?

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?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.