Melting butter is a physical change. Which best describes what is happening?
A. The butter changes into a different substance.
B. The butter contains a new arrangement of atoms.
C. The butter cannot turn into a solid again.
D. The butter no longer contains the same number of atoms.

Which property of fossils allow scientists to determine the relative rock ages..

The 20@kg wheel has a radius of gyration about its center g of kg = 300 mm. when it is subjected to a couple moment of m = 50 n # m, it rolls without slipping. determine the angular velocity of the wheel after its mass center g has traveled through a distance of sg = 20 m, starting from rest.

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?