can we blow the frog with a balloon and a straw and placing the straw and balloon in the frog's body 2nd Question Can The Frog Be Bigger If We Blow Alot And 3rd Question Will Its Body Tear Up
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Answer:
Unit vectors in the direction of the forces are
(36+4+9)
6i+2j+3k
,
7
3i−2j+6k
,
7
2i−3j−6k
Hence if F
1
,F
2
,F
3
, be the forces of magnitudes 5, 3, 1, then they are
7
5
(6i+2j+3k),
7
3
(3i−2j+6k) and
7
1
(2i−3j−6k).
Again if R be their resultant then
R=F
1
+F
2
+F
3
. ∴R=
7
1
[(30+9+2)i+(10−6−3)j+(15+18−6)k] =
7
1
(41i+j+27k). =
7
1
(41i+j+27k).
Again
AB
=P.V of B − P.V A =(4i−2j−6k)−(7i−2j−2k)=−3i+0j−4k
The work done by various forces is equal to work done by their resultant.
∴ Work done =R.
AB
=
7
1
[41i+j+27k].[−3i−4k] =
7
1
[−123+0−108]=
7
−231
=−33
So work done is ∣−33∣=33 units.
Explanation:
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