Aperson opens a 2-liter bottle of cola at a picnic. if the cap is left off the bottle, the cola will become 'flat' or lose it's carbonation. which statement below best summarizes why the cap must be kept tightly in place if the cola is to remain fresh?
a) the cap prevents the liquid in the cola from evaporating.
b) the cap keeps the atmospheric gases and liquid from mixing in the bottle.
c) the cap keeps warm air from entering the two-liter bottle and raising the temperature of the cola solution.
d) the cap keeps the pressure of the gas in the bottle at a high level preventing carbon dioxide from leaving the solution.

An charge with mass m and charge q is emitted from the origin, (x,y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.