Which of these is an example of an experiment?

plant growth is affected by temperature

leaves may change color due to temperature

add different quantities of water to three potted plants

the plant which gets the most sunlight grows the fastest

What two observable properties of a cepheid variable are directly related to one another?

Which of the following elements is the most reactive? Beryllium Calcium Magnesium Barium

Three pendulums all have the same length and start from the same height. The first pendulum is very light and has a mass of 67 g. The second pendulum has a mass of 1.5 kg. The final pendulum has a mass of 3.3 kg.

A ball is rolled uphill a distance of 5 m before it slows, stops, and begins to roll back. The ball rolls downhill 9 m before coming to rest against a tree. What is the magnitude of the balls displacement? A. 4 meters B. 9 meters C. 14 meters D.

Which of the following descibes the refraction of a wave?

Three light bulbs are wired in series. What happens if one of these light bulbs burn out

How do you distinguish a pure substance from a mixture?

Does the size of the particles change as the substance changes state?

What is the Z number of an atom with 9 protons, 8 neutrons, and 7 electrons? 7 8 9 16 17

What is the most dense crust