Consider a train car being pulled along a track by the engine. What are four forces acting on the train car?

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.

Argon, neon, and xenon are examples of

Which of the following are guidelines to follow for obtaining accurate observations