A sodium ion, Na+ , has a positive charge because it A. gained an electron.
B. lost a proton.
C. gained a neutron.
D. lost an electron.

Transfer chemicals from one location to another to weather objects. a-water b-physical weathering c-chemical weathering

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n