Some dog owners use a whistle in training that emits a very high-pitched noise that only dogs are able to hear, Is the dog whistle manipulating amplitude or frequency?

This element exists in adundance in the sun. explain how you would go about capturing sunlight. would this captured sunlight contain any of the element?

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Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number