A 1200 kg car pushes a 2200 kg truck that has a dead battery . When the driver stes on he accelerator, the drive wheels of the car push against the ground with force of 4000N. Rolling friction ca be neglected.

(a) What is the magnitude of the force of the car on the truck?
Express you answer to two significant figures and include the appropriate units.
(b) What is the magitude of the force of the truck on the car?
Express your answer to two significant figures and include the appropriate units.

When using the scientist method, which step comes last?

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging

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.