How do physicists use science?

A. They are always correct.

B. They use mathematics

C. They have opinions

D. They make observations

What is the hardest rock to break with a hammer

The hot gas lines need to be insulated? A never B always C if they are exposed to cold temperatures that could cause the refrigerant to condense in the line D for systems using hfc refrigerants

A cylinder has 500 cm3 of water. After a mass of 100 grams of sand is poured into the cylinder and all air bubbles are removed by a vacuum pump, the water level rises to 537.5 cm3. Determine the specific gravity of the sand.

Should I drop out of elemenertry school?

Sound will not travel through A. A vacuum B. Solids C. Liquids D. Gases

Scientists hypothesize that oxygen began to accumulate in earth's atmosphere of living things with the ability to?

The 3 stages of the water cycle are

What is the main natural force responsible for mass movement of rocks and debris?

In a mass spectrometer, a specific velocity can be selected from a distribution by injecting charged particles between a set of plates with a constant electric field between them and a magnetic field across them (perpendicular to the direction of

What is the force of attraction between two masses 5kg and 8kg at a distance of 60cm apart. (A) 4.5*10-9N (B) 5.6*10-9N (C) 7.4*10-9N (D) 8.0*10-9N (E) 10.5*10-9N