A student is measuring the lengths of caterpillars for an experiment. She measures 100 caterpillars using a ruler that measures to the nearest
centimeter. Which statement describes a change that could help improve the
results of her experiment?
A. Her measurements will be more precise if she measures an
additional 100 caterpillars.
B. Her measurements will be more accurate if she uses a ruler that
measures to the nearest millimeter.
C. Her measurements will be more precise if she uses a ruler that
measures to the nearest millimeter.
D. Her measurements will be more accurate if she measures an
additional 100 caterpillars.
Koi

hèllo, sorry i really need some more points so if you need this qustion answered than retype it

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

spare some change and give it to the poor

explanation:

plz : ((

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.