Round to 4 significant figures: 42,561

Designed to be a measure of the amount of energy released by an earthquake

The aurora is caused when electrons and protons, moving in the earth's magnetic field of ≈5*10-5 T, collide with molecules of the atmosphere and cause them to glow. What is the radius of the circular orbit for (a) an electron with speed 1.

When limestone (solid) is heated, it decomposes into lime (solid) and carbon dioxide gas. This is an extremely useful industrial process of great antiquity, because powdered lime mixed with water is the basis for mortar and concrete - the lime

How many atoms would be found in 1.2 grams of copper?

A student wants to investigate abiotic factors that affect tomato plants. He obtains four identical tomato plants. Which of the following investigations might he perform? A.

What volume of a 2.5 M NaOH solution is required to make 1 liter of a 0.75 M NaOH?

Which of the following statements is true about both nuclear fusion and nuclear fission? They occur in the sun. Heavy atoms are split. Two light nuclei combine. Some mass changes into energy.

What is the name of Nal? a) sodium (1) iodine b) sodium iodine c) sodium monoiodine d) sodium iodide

How to round 32.6721 according to the number of significant digits.

What is Absolute Zero?