Atrain travels 65 km in three hours and then 52 km in two hours. what is its average speed?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves