Which of these is a pure substance?

A. cake mix

B. ocean water

C. 10 carat gold

D. solid gold

Two objects are dropped from a bridge an interval of 1.0s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation increases. Can someone explain why it increases, instead of staying constant?

Light will not pass through a pair of polaroids when their axes are

What's the surface temperature of earth

Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove.

Can you burn copper into gold

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.