When measuring speed of sound in air, speed of light = 4f(length of column of air + 0.3 * diameter of tube). Why is multiplied by 4?
Where does the 4 come from?​

What can you increase the strength of an electromagnet by

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.

Identify the type of heat transfer occurring when chocolate melts in your hand