Calculate the net force on your 0.50-cm2 eardrum that air exerts on the inside and the outside after you drive from denver, colorado (elevation 1609 m) to the top of pikes peak (elevation 4301 m). assume that the air pressure inside and out are balanced when you leave denver, the pressure inside the eardrum does not change, and that the density of the air is constant and is equal to 0.80 kg/m3.

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.

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

If frequency goes up, what happens to wavelength? does it get shorter or longer?