A. Two identical conducting spheres are placed with their centers 0.30 m apart. One is given a charge of $+12 \times 10^{-9} \mathrm{C}$. The other is given a charge of $-18 \times 10^{-9} \mathrm{C}$. Find the electric force between them. Given: Unknown:

How are atomic mass and atomic number different from each other?

Two small identical conducting spheres are placed with their centers 0.30 m apart. One is given a charge of $12 \times 10 ^ { - 9 }$ C, the other a charge of $- 18 \times 10 ^ { - 9 }$ C. Find the electrostatic force exerted on one sphere by the other.

Two identical conducting small spheres are placed with their centers 0.300 m apart. One is given a charge of 12.0 nC and the other a charge of -18.0 nC. Find the electric force exerted by one sphere on the other.

Two identical conducting small spheres are placed with their centers 0.300 m apart. One is given a charge of 12.0 nC and the other a charge of -18.0 nC. The spheres are connected by a conducting wire. Find the electric force each exerts on the other after they have come to equilibrium.

Two small identical conducting spheres are placed with their centers $0.30 \textrm{ m}$ apart. One is given a charge of $12 \times 10 ^ { - 9 } \textrm{ C}$, the other a charge of $- 18 \times 10 ^ { - 9 }\textrm{ C}$. The spheres are connected by a conducting wire. Find the electrostatic force between the two after equilibrium is reached, where both spheres have the same charge.

State precisely and prove: The algebraic value of the covariant derivative is invariant under orientation-preserving isometries.

Simplify the expression. $3 \sqrt{x}-7 \sqrt{x}$

Criticize the following definitions in light of the eight rules for lexical definitions: “Semantics” is when somebody studies words.

22. $6x^2+17x+12$

A Norwegian scientist, Lars Vegard, determined the different wavelengths light, not a continuous spectrum, are present in the lights. How does Bohr's model of the atom account for this?

Compute the first three iterates of $z^{2}+(0.11-0.67 i)$ for each of the following starting complex numbers $z: 0+0 i, 0.5+0.5 i, 1+0 i,0+0.5 i$. Graph those points and their iterates on the same graph, and color green those points that seem to you would be headed toward infinity if you continued the iteration process.

Solve the given nonlinear system.

$$\left\{\begin{array}{l}{x=y+1} \\ {y=2 \sqrt{x+2}}\end{array}\right.$$

The electric potential of a battery is measured in volts. This unit can be expressed as $\text{kg}\cdot\text{m}^2\cdot\text{A}^{-1}\cdot\text{s}^{-3}$. Write the unit without negative exponents.