That's the Photoelectric effect. Einstein won his (only) Nobel Prize for his explanation of the Photoelectric Effect, published in 1907.
Ionic Bonding: The formation of an Ionic bond is the result of the transfer of one or more electrons from a metal onto a non-metal. Covalent Bonding: Bonding between non-metals consists of two electrons shared between two atoms.
When you talk about "the strength of an electric force" in middle school, I'm pretty sure you're talking about the force between two electrostatic charges that either pulls them together or pushes them apart.
The strength of that force depends on
-- the product of the amounts of charges on the two charged objects
-- the distance between the centers of their charges.
496/1127 = 0.44 = 44%
<span>sin A = 0.85/2.1. </span>
<span>A = 23.9o. </span>
<span>Fp = 1127 sin23.9 = 457 N. = Force parallel to the ramp. </span>
<span>Fn = 1127 Cos23.9 = 1,030 N. = Force </span>
<span>perpendicular to the ramp = Normal force. </span>
<span>Eff. = Fp/Fap = 457/496 = 0.92 = 92%
Correct answer: 92%</span>
