Two trains, each having a speed of 30 km/h, are headed toward each other on the same straight track. a bird that can fly 60 km/h flies off the front of one train when they are 60 km apart and heads directly for the other train. on reaching the other train it flies directly back to the first train, and so forth. calculate the total distance the bird travels before the trains crash.

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented. b)scientists had not completely finalized their results, which took 30 years. c)cigarettes were cheaply available and media channels were very inefficient. d)cigarette manufacturers were trying hard to bring an alternative into the market

What occurs during a combustion reaction

The speed of light can be used to measure the