15. A cannon is fired horizontally off the top of a castle wall towards a very intimidating dragon. The cannon ball leaves the cannon at 50.0 m/s, and lands at the feet of the dragon 200.0 m away. How high are the castle walls?

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.)

Explain what happens at the saturation point when adding salt to water at room temperature.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.