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Question
Physics
As pluto moves from the perihelion to-the aphelion, the work done by gravitational pull of Sun on Pluto is
Q. As pluto moves from the perihelion to-the aphelion, the work done by gravitational pull of Sun on Pluto is
1970
233
Gravitation
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A
is zero
38%
B
is positive
15%
C
is negative
34%
D
depends on seiice of rotation
13%
Solution:
As gravity is an attractive force and acts towards the centre of sun.Now taking Pluto from the perihelion to the aphelion means it is moving away from Sun,thus from
W
=
f
.
s
implies that work done by gravitational force has to be negative.