Wave a has an amplitude of 2, and wave b has an amplitude of 2. what will happen when the crest of wave a meets the trough of wave b? they will interfere to create a crest with an amplitude of 0. they will interfere to create a crest with an amplitude of 2. they will interfere to create a crest with an amplitude of 4. they will bounce off each another.

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented. b)scientists had not completely finalized their results, which took 30 years. c)cigarettes were cheaply available and media channels were very inefficient. d)cigarette manufacturers were trying hard to bring an alternative into the market

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

Write down two additional questions about earth's magnetic field that will make your presentation more informative.