Р
(6) The figure shows a regular pentagon and
regular hexagon put together. How
.
2
R.
much is PQR?
Answers
Answered by
2
Answer:
The vertex angle of pentagon is 108 degrees.
Let the length of side of pentagon be a , by sine rule we get
sin9 =
sin54
1/8
, which gives a=0.1545
Perimeter of pentagon is 5×0.1545=0.77.
Initial potential energy U
1
=
RQ
kqq
1
where k=9×10
9
Nm
2
/C
2
⟹U
1
=
0.8
9×10
9
×3×10
−10
×1
=
8
27
J
Finally,
U
2
=
QP
kqq
1
=
0.6
9×10
9
×3×10
−10
×1
=
6
27
J
Work done W=U
2
−U
1
=
6
27
−
8
27
⟹W=1.125J
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Answered by
1
Answer:
where is the figure.??
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