If you have 10.0 g of a substance that decays with a half-life of 14 days, then how much will you have after 42 days?
a. 0.10 g
b. 0.31 g
c. 1.25 g
d. 2.50 g

Asmall, positively charged ball is moved close to a large, positively charged ball. which describes how the small ball likely responds when it is released? it will move toward the large ball because like charges repel. it will move toward the large ball because like charges attract. it will move away from the large ball because like charges repel. it will move away from the large ball because like charges attract.

Anybody wanna ? (picture included? )

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?