The human brain is located in the upper portion of the head with a volume that could be approximated by a cube 1=20 cm on a side. Brain cells,
consisting of 10% neurons and 90% glia vary in size with dimensions ranging
from a few microns to a metre or so. Taking d=10 microns as a typical
dimension and consider a cell to be a cube with each side having that length,
estimate the number of brain cells in the human brain.​

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

What determines the amount of inertia an object has

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?