Which of the following is not permitted, based on the second law of thermodynamics?
O A. A machine that is 80% efficient
O
B. Heat being completely converted into mechanical energy
o
C. Heat flowing from hot to cold
O
D. Heat flowing from cold to hot
SUBMIT

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

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Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.