Which scientist studies the earth's core, the mantle, the crust, continents, and the ocean floor?
a geologist
a meteorologist
an oceanographer
an astronomer

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.