How do scientist determine how old the world is and the fossils inside of it?

According to a rule-of-thumb, every 5 seconds, between a lightning flash and the following thunder gives the distance to the flash in miles.

If total (PE + KE) is conserved:

Raul dug a hole in his yard to repair a water pipe. It took him 2 seconds to apply a force of 50 Newtons to push the shovel 0.25 m into the ground. How much power was used? A 0.01 watts B. 6.25 J/S C. 25.00 N-m-s D. 100.00 watts

Read the list of substances Air, Copper, Glass, Gold, Wood which substances have highly electrical conductivity? A) Air and Copper B) Air and Glass C) Copper and Glass D) Copper and Gold

Which of the following is NOT a state of matter? A. gas B. light C. liquid D. solid

Which nitrogen base sequence is the partner of C-A-T-C-G-A? O C-A-T-C-G-A O G-T-A-G-C-T OT-G-C-T-A-G O G-C-A-T-G-T TI

What is the kind of energy that comes from movement?

The average kinetic energy of 1 mole of a gas at 273 degrees Celsius is: 6.81 x 103 J 3.40 x 103 J 1.51 x 103 J 6.72 x 101 J

Which one of the following crystal structures has the fewest slip directions and therefore the metals with this structure are generally more difficult to deform at room temperature? a. BCC b. FCC c. HCP d. BCT

To rid the body of wastes, including excess water and salts" is the purpose of what human body system? A) Digestive B) Excretory C) Skeletal D) Nervous