If the amplitude of a wave changes, which of the following changes?

Aristarchus measured the relative sizes of the Earth, Moon, and Sun using eclipses and phase timings. Since the Moon is smaller than the Earth and orbits the Earth and the Earth is smaller than the Sun, he deduced that the Earth must orbit the Sun.

Are microbe multicellular

Carry out the following calculation. Express your answer in the correct number of significant figures. A solid rectangular block has a density of 2.6 g/cm3. The block measures 1.8 cm by 4.0 cm by 2.3 cm. What is the mass, in g, of the block?

Why should spray cans not be heated?

What are two things people never eat before breakfast

A solid sphere of radius R has a total charge Q distributed evenly throughout its volume. What fraction of the total charge is located inside a radius R/2?

What is Nothing. (sorry i have been wondering this for a very long time)

What is the speed of a bobsled whose distance-time graph indicates that it traveled 123m in 28s?

Eric has a mass of 80 kgkg. He is standing on a scale in an elevator that is accelerating downward at 1.7 m/s2m/s2. What is the approximate reading on the scale?

Without the force of friction, people would not be able to walk.