Is the number of protons and electrons the same for a neutral atom of a given element?

Which statement is true about air at different temperatures? Hot air is denser than cool air. Cool air contains lighter particles than hot air. Particles in hot air move faster than particles in cool air.

What type of energy does a tennis ball have?

What is tension? a. stress squeezing an object c. stress breaking an object b. stress pulling an object d. stress releasing an object

Which is most likely the length of a student's textbook? 30 millimeters 30 centimeters 30 decimeters 30 hectometers

Maglev trains use magnets on the train and guideway to levitate the train off the track. The north pole of the magnets on the train must face the.? A. south pole of the magnets on the guideway so they repel. B.

In an experiment, the control is never changed by the scientist not important to the scientist not recorded by the scientist changed by the scientist

When you catch a baseball, what kind of work do you do, negative or positive? by catching the ball, what do you change? what energy does it gain or lose?

All describe work except A) a team of dogs dragging a sled B) a jokey sitting on a horse C) a bowler lifting a bowling ball

Who is known as the father of toxicology

In which layer of the sun is energy transfferred between atoms?