Physics, 31.05.2020 23:58 PleaseHelpMe9428
A 1000.-kilogram roller coaster goes down a hill that is 90. meters tall. Its speed at the bottom is 40. m/s.
a. What is the efficiency of the roller coaster? Assume it starts from rest at the top of the hill.
b. What do you think happens to the lost energy?
c. Use the concepts of energy and efficiency to explain why the first hill on a roller coaster is the tallest.
Answers: 3
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If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.
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