Asound-producing object is moving toward an observer. the sound the observer hears will have a frequency that actually being produced by the object. lower than the same as higher than

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.)

In an experiment, how can i change human errors? be specific.

What is the single most important equation in all of physics?