B1: The coefficient of static friction between the road and a car tire is 0.7. The coefficient of kinetic friction is 0.55. The mass of a car is 1500 kg.
a. Calculate the maximum static friction force possible between the car’s tires and the road.
b. Calculate the kinetic friction force between the car’s tires and the road.
When you apply the brakes, the friction between the tires and the road is the net force (ignoring air resistance and other
complicating factors).
c. Calculate the car’s acceleration while braking if it doesn’t skid (i. e. static friction).
d. Calculate the car’s acceleration while braking if it does skid (i. e. kinetic friction).

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.