Until a train is a safe distance from the station, it must travel at 5 mis. Once the train is on open track, it can speed up to 45 mis. Mit takes a train 8 seconds to reach 45 mis. what is the acceleration of the train?
mis?

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The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

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Which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules? a. q b.w c.v d.u