Find the period of the earth having a mass of 6 x 10²⁴ kg, if it rotates about the sun in an orbit of radius 20000km. (a) 7.803hrs (b) 7.703hrs (c) 7.903hrs (d) 7.603hrs (e) none of
the above​

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

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.

Work = force × a. work b. energy c. distance d. momentum