Iodine-131 has a half life of 8 days. After the disaster at F-ukushima, a fish ingested 64g of this radioactive material. 32 days later, how many grams would still be in the fish as Iodine-131? (simply provide a numerical answer) *

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

What happens when a rubber rod is rubbed with a piece of fur?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?