List two reasons why the limestone blocks of the pyramids were so difficult to push across land.

What happens if there is too much friction?

Hardness may be defined as the resistance of a material to scratching. a. True b. False

Two astronauts Adam and Beverly are having a friendly argument

Galileo's three most important discoveries were? List and explain them

Objects one and to attract each other with an electrostatic force of 36 units if the charge of object one is hacked then the new electrostatic force will be

It is epistemically possible that a completed physics might include which of the following propositions? O Souls and other spiritual substances exist O God created the universe O Matter is unreal O All of the above

The weight of an object varies inversely with the second power of the distance from the center of Earth. The radius of Earth is approximately 4000 miles.

The chemical reaction of oxygen with other substances is called A. erosion. B. oxidation. C. exfoliation. D. acidification.

Find the net charge of a system consisting of 6.16*106 electrons and 7.68*106 protons. Express your answer using three significant figures. Qnet = 2.43*10-13 C

A motorist is driving at 20m/s when she sees that a traffic light 200m ahead has just turned red. She knows that this light stays red for 15s, and she wants to reach the light just as it turns green again. It takes her 1.