When the popcorn kernel popped, was it because it was heated by light or hot ai from the flashlight

Suppose you were asked to find the torque about point p due to the normal force n in terms of given quantities. which method of finding the torque would be the easiest to use?

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Wavelength, frequency, and energy are related. what happens to a wave as it’s wavelength gets shorter?