To remove a tight-fitting lid from a jar, Megan runs the lid under ot water.
What happens to the jar lid when its temperature increases?
The potential energy decreases, and the lid expands. -Im
The temperature increases, and the lid expands.
O The potential energy increases, and the lid contracts.
O The temperature decreases, and the lid contracts.

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.