The mineral crystals in obsidian are too small to see without a microscope. this is because it
a.)formed below the crust
b.)cooled very slowly
c.)cooled very quickly
d.)formed at high temperatures

Describe the path of the electric current through a circuit?

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?