Answer:
maybe c. because if you do 70
Explanation:
-50 you get 20 than you add that to the 25 and you get 45 and the nearest closest number is 47
Answer:
U_total = 3.51 10⁻¹ J
Explanation:
The electic potential energy is
U = ∑ k qi qj / rij
Where k is the Coulomb constant 8.988 109 N m² / C², q are the electric charges and r is the distance between them
Let's apply this equation to our case
Total U = U₁₂ + U₁₃ + U₂₃
The distance between them is the length of the triangle L= 0.3 m, the charge are equal q = 1.40 10⁻⁶ C
U₁₂ = k q₂ / L
All energies are equal for this case, we substitute in the total potential energy
U_total = 3 (k q² / L)
U_total = 6 k q² / L
We calculate
U_total = 6 8,988 10⁹ (1.40 10⁻⁶)² / 0.3
U_total = 3.51 10⁻¹ J
Answer:
density of cube =11.605 g/cm³
Explanation:
density of a substance is the mass per unit volume of that substance.
the density of a substance =
volume of a cube = l³,
l = 19.0mm , lets convert mm to cm
1mm = 0.1cm, thus, 19mm =19*0.1 =1.9cm
length of cube =1.9cm
volume of cube = 1.9³
density of cube =
density of cube =11.605 g/cm³
<span>more lines = a lot of electrons returning back to ground state from same level</span>