What law states that when matter undergoes a physical or chemical change, no atoms are created or destroyed?

What makes up the large, bright rings of Saturn?

A person is pushing against a couch with a force of 50 n. what is the force of the couch against the man if the couch does not move?

In an adiabatic process, what happens when gases in a system are compressed? A) the system absorbs all of the heat B) the system releases all of the heat C) the temperature of the system increases D) the temperature of the system decreases

The velocity of sound on a particular day outside is 331 meter/sound. what is the frequency of a tone if it has a wavelength 0.6 meters?

This is the constructive or destructive overlap of waves. Example: the high pitched feedback when a microphone gets too close to a speaker

What trends were seen in Mendeleev's periodic table?

Through which medium would EM waves travel the fastest? A. The Ocean B. The Atmosphere C. Rocks

Average mass of a toy car (small, hot wheels) ?

A cannon directed straight upward launches a ball with an initial speed v. The ball reaches a maximum height h in a time t. Then, the same cannon is used to launch a second ball straight upward at a speed 2v.

Does the sun fuse hydrogen into helium or vice versa?