What is the half-life of a 100 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s?

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .