What is the main reason that the spectra of all stars are not identical? Explain.

Which of the following statements is (are) true? (A) The total mechanical energy of a system, at any one instant, is either all kinetic or all potential energy.

How do scientist analyze empirical evidence?

Law of conservation of mass "When you burn a log in the fireplace, the resulting ashes hae a mass less than that of the original log. Account for the difference in mass."

How could you increase a magnet's power without using electricity?

If you use a stick to push an object, the muscular force acting on it is a non contact force. True or false? Explain

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells