What's a substance made up of two or more elements

Which statement describes how echolocation and ultrasound imaging are the same? A. They both use the absorption of sound waves. B. They both use the diffraction of sound waves. C. They both use the reflection of sound waves. D.

Which will have a greater affect on the potential energy of someone. doubling the height or doubling the mass?

Just for funs: If a fly is moving forward in a train that is going 100mph then is the fly going faster than the train?

Three children are riding on the edge of a merry‑go‑round that has a mass of 105 kg and a radius of 1.40 m. The merry‑go‑round is spinning at 20.0 rpm. The children have masses of 22.0, 28.0, n 33.0 kg. If the 28.

The international space station orbits the earth at a distance of 6,783 km from the center of the earth it travels at 7.66 km/s. Find the time it takes for the ISS to complete one orbit.

If the Coast Guard warns of a giant wave of water approaching the shore as a result of a major earthquake, they are warning of a. an aftershock. b. liquefaction. c. a tsunami. d. landslides.

What is the total number of atoms in the following formula? CaBr2 4 3 2 1

Object A with a mass of 500 kilograms hits stationary object B with a mass of 920 kilograms. If the collision is elastic, what happens after the collision? A) Both object A and object B move forward but with different velocities.

A young man walks daily through a gridded city section to visit his girlfriend, who lives m blocks East and nblocks North of where the young man resides.

Aliens from planet Moby have three alleles for skin color: R (red) W (white) and B (Blue). If all of these alleles are codominant and aliens on planet moby can only inherit two alleles for a gene, what are the six possible genotypes for skin color