Two spheres (one with a 12 cm radius, the other with a 18 cm radius) are separated by a distance of 50 cm from surface to surface. each sphere has a charge density of 1.2 nc/m3. what is the force on the 12 cm sphere? 2. from problem 1, what is the electric field at the midpoint between the center of the spheres

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.