What do the gravitational force and the electric force have in common? A The force in each case depends on the inverse of the square of the distance separating the objects.

B Friction can cause objects to acquire both electric charge and mass.

C They are both approximately the same strength.

D The force in each case is capable of attracting or repelling.

E Gravity depends on charge. The electric force depends on mass.

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.

Which branches of natural science include the study of an organism that lived 10 million years ago

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.