4. Find the density of 2750 g of a substance that occupies 250 mL.​

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.)

What are some properties of transverse waves?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?