What is the connection between the liver (organ), uv radiation (sunlight), and bone tissue
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Ответ:
The UV is needed by the skin to make previtamin D3. Previtamin D3 or cholecalciferol made from the skin will be changed in the liver into 25- hydroxyvitamin D3 and then sent to the kidney to be changed into 1,25- dihydroxyvitamin D3. The last change in the kidney will active the vitamin D. Vitamin D has a role in the calcium absorption which was will strengthen the bone tissue.
Ответ:
K = 2 10⁻⁸ J
Explanation:
Let's solve this exercise in parts, we start by finding the charge on each plate of the capacitor
C = Q / ΔV
C = ε₀ A / d
ε₀ A / d = Q / ΔV
Q = ε₀ A ΔV / d (1)
indicate the potential difference ΔV₁ = 12 V, the distance between the plates d₁ = 3 mm = 0.003 m,
as the power supply is disconnected and the capacitor is ideal the charge remains constant
in the second part we separate the plates at d₂ = 5 mm = 0.005 m, using equation 1
ΔV₂ =![\frac{Q d_2}{ \epsilon_o A}](/tpl/images/1400/5508/07742.png)
we substitute the equation for Q
ΔV₂ =![\frac{d_2}{\epsilon_o A} \ \frac{\epsilon_o A \Delta V }{d_1}](/tpl/images/1400/5508/f2977.png)
ΔV₂ =![\frac{d_2}{d_1} \ \Delta V_1](/tpl/images/1400/5508/5867c.png)
in the third part we use the concepts of energy
starting point. Test charge near positive plate
Em₀ = U = q ΔV₂
final point. Test charge near negative plate
Em_f = K
energy is conserved
Em₀ = Em_f
q ΔV₂ = K
K = q ΔV₁![\frac{d_2}{d_1}](/tpl/images/1400/5508/a2080.png)
we calculate
K = 1 10⁻⁹ 12 0.005/0.003
K = 2 10⁻⁸ J