general science questions with some math

[mrsents]

If a runner runs 400m laps each lap. She times herself per lap. Lap 1 60s, Lap 2 57s, Lap 3 55s and Lap 4 53s. What average in velocity in meters per second (m/s) does she run?



One neuton is added to the nucleus of an atom of carbon dioxide -12. How has the atom changed?



If Aluminum is .22 kcal/kg degrees celcius and iron is .11 kcal/kg degrees celcius. If 1 kg of aluminum and 1 kg of iron recieve 1.10kg of energy. Which one recieves the most energy and why?



If 2 waves are traveling through a container with nitrogen gas. The Amplitude of the first wave is .3cm and the amplitude of the 2nd wave is .9cm. Which wave is going fastest and why?


What property explains why water floats on top of a pond rather than sinking?

[amyC]

Hi Mrsents - The Ask an Expert forums are designed to offer answers and help with science fair projects or other science projects. Our experts can not help with homework-type questions. If you are working on a project and need assistance, please follow up with an overview of your project and what questions you may have.

Amy
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