A pendulum with string length 1.5 m is dropped from rest. If the mass at
the end of the pendulum is 23 kg,
what is its initial potential energy?
Please help I'll give whoever answers first brainiest , 15 POINTS!

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

When the mercury level in a barometer decreases that atmospheric pressure has

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution