Headline Clickable. Whether raw or cooked, food can be chock-full of dangerous bacteria long before you can smell it. Perishable food (like chicken and other meats) should be tossed if left out at room temperature more than two hours (much less if in a warm room).
Catapult physics is basically the use of stored energy to hurl a projectile (the payload), without the use of an explosive. The three primary energy storage mechanisms are tension, torsion, and gravity.
The noun refers to a catapult, which uses stored tension to launch something a long way. This is not to be confused with a trebuchet, which launches something using a counter-weight. Catapult can mean one of two things, depending on whether you're referring to the verb; or the noun. If referring to the verb, it means to launch something. For instance, catapulting something off of a cliff would mean the same as launching it off of the cliff. The noun refers to a catapult, which uses stored tension to launch something a long way. This is not to be confused with a trebuchet, which launches something using a counter-weight.