Suppose you drop a rockinto a darkwell and, using precision equipment, you measure the time for the sound of a splash to return. (a) Calculate the time required for sound to travel up the well, calculate the distance tothe water if the sound returns in 2.0000s. (b) Now calculate the distance taking into account the time for sound to travel up the well. The speed of sound is 332.00m/s in this well.​

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

If element x has 99 protons how many electrons does it have