In a Bohr-model hydrogen atom, what force holds the electron in orbit around the proton? a gravitational force that is radially inward, toward the proton a gravitational force that is radially outward, away from the proton an electric force that is radially outward, away from the proton an electric force that is radially inward, toward the proton
![Your young sibling is on a swing set, hanging vertically initially at rest. The combined mass of the swing and your sibling is 49 kg, and the light ropes are 2.51 m long. You push your sibling with an applied external force that is always tangent to the circular path, but that varies in magnitude as a function of angle θ in radians measured from the vertical as Ft(θ) = 364⋅(1 − θ) Newtons. Use g = 9.81 m/s2. In moving the swing from θ1 = 0 to θ2 = 0.49 radians = 28.07 degrees with the vertical, what is. . . a) [2]. . . the work done by you? WF = J b) [2]. . . the work done by gravity? Wgrav = J c) [2]. . . your sibling's speed? v = m/s](https://www.doubtrix.com/uploads/editor/4252729143QJBcqLabuf.png)