Four people are needed to lift a TV set with a single fixed pulley. How many people will be needed to lift the same TV set with a 2 fixed, 2 moveable pulley system? (Ignore friction.)

What is the prosses by which the movement of sand dunes occur?

A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume? Solution A: 1.31% (m/v) starch Solution B: 7.48% (m/v) starch 2. A semipermeable membrane is placed between the following solutions.

What energy drives the rock cycle that makes it work?

Any units will do. For example, let's use the unit of "dozens": 2 dozen of H2 particles + _ (1, 2, or 3) __ dozen of O2 particles → _ (1, 2, or 3) _ dozen water particles

Which of the following can be used to neutralize an ammonia (NH3) solution? NaCl H2O HNO3 Ca (OH) 2

In potassium-argon dating, how does the proportion of remaining potassium in a rock or fossil change over time?

What feature must any molecule or ion have in order to act as a lewis acid?

Xco3 enter the group number of x

What are the three challenges of life? What kind of challenges can you see these organisms dealing with?

What is the difference between molarity and normality