What is the angle of incidence of a wave if its angle of reflection is 20 degrees? a) 10

b) 70

c) 20

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?