Well this is just my opinion but I think because all the plants were gone they cant stop mud from rolling into it. Also when it rains the trees wont suck up the water, that will make it over flow and release into the land or dirt on the outsides of it. Mixing those two gives mud and it can potentially flow back in the river in largeish masses causing the river to mix with the mud makinging it more muddy. Hope this helps :D
True!!!!!!!!!!!!!!!!!!!!!
Answer:
not work
Explanation:
in a series circuit, everything meaning the electrons are flowing on one path, therefore, it wouldn continue to work.
Answer:
U= 1.9*10^-7
Explanation:
given:
<em>L=8 cm</em>
<em>d_1=d_2=2.05_10^-3</em>
<em>K_py=4.3</em>
<em>K_po=3</em>
<em>V_ab=86 V</em>
required
U=??
solution:
the energy stored in the capacitor
U=1/2C_t*V^2_ab (1)
voltage is known but capacitance is not
we can consider the two plates of polystyrene and pyrex glass as a two separate capacitors connected on series so the total capacitance of series capacitor is given by:
1/C_t= 1/C_py+1/C_po (2)
the capacitance of polystyrene
C_po=K_po*A/d
=8.9*10^-11
= 89 pF
the capacitance of pyrex
C_py=K_py*A/d
=128 pF
substitution in 2 yields
1/C_t= 1/128+1/89
C_t= 52.6 pF
substitution in 1 yields
U=1/2C_t*V^2_ab
= 1.9*10^-7
