The half-life of Hafnium-156 is 0.025 seconds. How many seconds would it take a 560 g sample to decay to one-fourth of its original mass?

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.