Mary pushes a crate by applying force of 18 newtons. Unable to push it alone, she gets help from her friend, Anne. Together they
2 answers:
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Answer:
Therefore, the new rotation rate of the satellite is 6.3 rev/s.
Explanation:
The expression for conservation of the angular momentum (L) is
Where
initial moment of inertia and angular velocity
is the final moment of inertia and angular velocity
The expression of moment of inertia of the satellite (a solid sphere) is
Where is the satellite mass
r is the radus of the sphere
Substititute 1900kg for m and 4.6m for r
The final moment of inertia of the satellite about the centre of mass
Where is the antenna's mass and
I is the length of the antenna
So, the Final rotation rate of the satellite is:
Therefore, the new rotation rate of the satellite is 6.3 rev/s.
Answer:
Wg is positive and WT negative.
(Letters in options are all wrongly written).
Explanation:
Remember that the work of a force is the internal product between the force and the displacement .
Since the displacement is downwards like the weight, the work done by gravity is positive, while the work done by the tension is negative since it points upwards.