A 62 kg box is lifted 12 meters off the ground. How much work was done?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

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.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.