Ameasurement of an ore mixture at equilibrium shows 2.1xl0^4 times as many^235u atoms as^231pa atoms. calculate the half-life of^235u from the assay data and the known half-life of^231pa (3.28x10^4 yr).

The velocity of car is 80.0 miles per hour. what is the velocity of car in meters per second? (1 km -0.621 miles) m/s

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant