What is the correct coefficient for 2H2 + O2 →2H2O

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Atoms containing radioactive nuclei are called

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.