Billiard ball A strikes another ball B of the same mass, which is at rest, such that after the impact they move at angles ΘA and ΘB respectively. The velocity of ball A after impact is 4.70 m/s at an angle ΘA = 33.0 ° while ball B moves with speed 4.50 m/s. Figure showing a layout of the problem as described in text What is ΘB (in degrees)? What is the original speed of ball A before impact?

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

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)

What are known as the properties of substances that describe a substance et does not change that substances?