Which statement best explains why the atomic theory developed efficiently? A- scientists ignored all previous knowledge about atoms.
B- scientists had used creativity and The scientific method in their investigations.
C- scientists had used the philosophical viewpoint as a method of investigation.
D- scientists rarely repeated experiments to make sure the results were correct.

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s