20. The change in isotopes over time due to the emission of radioactive particles is known as

A. absolute-age dating.

B. radioactive decay.

C. half-life.

D. radiometric dating.

Stars are classified mainly according to their distance from Earth. A. True B. False

A cup sits on a table. Due to its position, the potential energy of the cup is 3.00 joules. Ignoring frictional effects, if the cup falls off the table, how much kinetic energy will it have when it is halfway to the floor? 3.00 J 1.50 J 0.

A solid disk has a total kinetic energy k. what is its rotational kinetic energy krot if it's rolling without slipping?

On his honeymoon, James Joule attempted to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc.

Explain the differences between a physical and chemical change, and give examples of each.

When the particle with charge q reaches the center of the original square, it is, as stated in the problem, momentarily at rest. Is the particle at equilibrium at that moment?

How does the bohr model represent electrons around the central nucleus why think of the spectra?

Refrigerated air reads 68°f and appears to be climbing: food is at 41°f. what should you do

Which piece of equipment would give the MOST accurate measurement of 45 mL of a liquid? A) A 100 mL graduated cylinder B) A 50 mL graduated cylinder C) A 100 mL beaker D) A 50 mL flask

A 54-kg jogger is running at a rate of 3m/s. What is the kinetic energy f the jogger