A certain train preparing to leave the station blows its whistle. Sound travels at 343 m/s in dry air. How many seconds will it take for the sound to reach the first crossing, which is 2.50×103 feet away

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.

Which sample at stp has the same number of atoms as 18 liters of ne at stp

What is the importance of interlocking the fingers and rubbing while washing hands? the palms are the dirtiest parts of the hands. the spaces between the fingers get washed. the backs of the hands get washed. the fingernails are the dirtiest parts of the hands