What effect does friction have on a moving object? i forgot this pls tyy
a. it causes the moving object to speed up.
b. it causes the moving object to slow and eventually stop.
c. it causes the moving object to turn around and move in the opposite direction.
d. it keeps the moving object moving in the same direction forever.

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.