The electric force between two charged particles is 0.18 newtons. If the distance between them is increased by a factor of 3.0, what will the new electric force be?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?