The normal force always points to the two surfaces in contact. a. parallel
b. perpendicular
c. at 45 degrees
d. at an unknown angle

What properties of a moving object are used in determining the object's energy of motion

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)