Two particles a and b, move with constant velocities →v1 and →v2. at the initial moment their position vectors are →r1 and →r2 respectively. the condition for particles a and b for their collision is :

(1)vector r1 - vector r2 = vector v1 - vector v2

(2)vector r1 - vector r2/magnitude of (vector r1 - vector r2 ) = vector v1 - vector v2/ magnitude of (vector v1 - vector v2)

(3)vector r1 . vector v1 = vector r2 . vector v2

(4)vector r1 x vector v1 = vector r2 x vector v2

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

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

Utah's great salt lake has an average salinity seven times higher than that of the oceans. very few multicellular organisms live in this harsh environment. an example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. these brine shrimp must available hint(s)utah's great salt lake has an average salinity seven times higher than that of the oceans. very few multicellular organisms live in this harsh environment. an example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. these brine shrimp must pump water back into their cells to counter its loss due to osmosisactively pump water back out of their cells to counter its inflow due to osmosissynthesize membranes that are impermeable to substances that upset osmotic balanceactively pump salt back out of their cells to counter its inflow due to osmosis