Question

Р
(6) The figure shows a regular pentagon and
regular hexagon put together. How
.
2
R.
much is PQR?​

Answer 1

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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Answer 2

Answer:

where is the figure.??