1. a friend measures the length of the school
soccer field to be sure that it is the correct size.
which measuring device will most likely
your friend get the most accurate answer?
a) a 50-m tape measure accurate to
the nearest cm.
b) a meter stick accurate to the nearest cm.
c) a meter stick accurate to the nearest mm.
d) a 30-cm ruler accurate to the nearest mm.

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

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .