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.)

Which of the following is not an ultimate goal of science? A. Make predictions B. Produce unchanging, absolute answers C. Give explanations for natural events D. Understand patterns

When heated a sample consisting of only CaCO3 and MgCO3 yields a mixture of CaO and Mgo. If the weight of the combined oxides is equal to 51.00% of the initial sample weight, calculate the per cent of CaCO3 and MgCO3 in the sample. (12 M.)

When an atom is chemically stable how many electrons are in its outer energy later?

What does osmosis depend on? A. the identity of the solute and solvent B. how much solvent is present in the solution C. the number of particles present in the solution D. it does not depend on anything

Which mass of urea, CO (NH2) 2, contains the same mass of nitrogen as 101.1g of potassium nitrate?

What is molarity of heavy water?

Do all liquids freeze at the same rate

Convert 1.67 x10^24 atoms of carbon to moles of carbon

The knowledge of chemistry not important in one of the following? A, in agriculture B, in Geology C, in medicine D, none

Which is the balanced equation for: Al2O3 + Fe - Fe3O4 + AL