Please help! I need an answer for my exam and I can’t find it anywhere. A tuning fork is struck and is vibrating at a single frequency. If a second tuning fork with the same frequency is placed near the first it begins to vibrate. This is an example of .

forced vibration
resonance
Doppler effect
beats

What is the temperature in degrees celsius of a substance with a tempature of 49k

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?