A student thinks that scientific theories are not reliable sources of information, since scientists tend to argue about the details of them. What is the flaw in the student's reasoning? A* The arguments between scientists tend to make theories stronger, not weaker.
B* Scientists rarely disagree about scientific theories.
C* Scientific theories do not change over time, which makes them reliable.
D* It is rare for a scientific theory to be valid for more than a few years.

Two red blood cells each have a mass of 9.0 multiply.gif 10-14 kg and carry a negative charge spread uniformly over their surfaces. the repulsion arising from the excess charge prevents the cells from clumping together. one cell carries −2.50 pc of charge and the other −3.10 pc, and each cell can be modeled as a sphere 7.5 μm in diameter. (a) what speed would they need when very far away from each other to get close enough to just touch? assume that there is no viscous drag from any of the surrounding liquid. answer is: 321 m/s how do i find this (b) what is the maximum acceleration of the cells in part (a)? answer is: 1.38e+10 m/s2 how did they find this answer

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter