Suppose you have 50 grams of isotope with a half life of 2 years. how much is the isotope will you have after 4 years

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

If a sphere and a cure have the same mass and are propelled up a ramp with the same force, which would travel father up the ramp? explain.