If the half-life of an isotope is 3 years, what fraction of the isotope remains after 15 years? (put fraction in as decimal)

Two thin 80.0- cm rods are oriented at right angles to each other. each rod has one end at the origin of the coordinates, and one of them extends along the x- axis while the other extends along the yaxis. the rod along the x- axis carries a charge of - 15.0 μ c distributed uniformly along its length, and the other rod carries 15.0 μ c uniformly over its length. find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

Which composition of water moves to begin a deepwater current?