Kevin writes this description on the blackboard:

"this is a way of writing a value as the product of a number, n, between 1 and 10 and a power of 10."

what is kevin describing?

1. scientific notation
2. common logarithm
3. multipication factors
4. significant figures.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Ameter stick is pivoted at the 0.50-m line. a 3.0-kg object is hung from the 0.15-m line. where should a 5.0-kg object be hung to achieve equilibrium (the meter stick oriented horizontal and motionless)?

Anybody wanna ? (picture included? )