An apple is dropped from a 260m high building. How long will it take to hit the ground in seconds)?

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

Gunpowder residue is most likely to show up where on a shooters hands

This is the number of complete movements of a wave per second.