An object weighs 3 lb. at 10 earth radii from its center. What is the object's weight on the earth's surface? lb. 3 30 300 3,000

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

The air that we breath is made mostly of which gaseous molecule

Slab pull” is a type of tectonic plate movement that occurs due to the forces of mantle convection and results in the subduction of the lithosphere true or false