What pressing problem did the invention of the cotton gin solve?
A. removing seeds from cotton fiber
B. efficiently harvesting raw cotton
C. quickly plowing the cotton fields
D. irrigating the fields of cotton plants

the answer is A .

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)

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

A10 kg box initially at rest is pulled 18 meters across a horizontal, frictionless surface by a 40 n force. what is the block’s final velocity over the 18 meters?