Help please? An electric charge always moves spontaneously from a position of potential energy.

higher to lower

lower to higher

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?