When a substance changes from a solid to a liquid, what happens to the motion of its particles?
A. They move at the same speed but in random directions,
B. They move more slowly and become fixed in position
C. They move more quickly and begin to move past one another
D. They move more quickly and independently.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

At what time will the interfering waves have an amplitudeof zero?

The vector a? is 3.50 cm long and is directed into this page. vector b? points from the lower-right corner of this page to the upper-left corner of this page and has the components bx=-19.5 cm , by=25 cm. in the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page, and +z-axis out of the page, find the x-component of the vector product a? ×b? , measured in cm2.