
Concept explainers
(a)
The speed of the asteroid by which it strikes the moon's surface when it is falling with speed of

Answer to Problem 46QAP
Speed of the asteroid by which it strikes the surface of moon is
Explanation of Solution
Given:
Mass of the moon =
Radius of the moon =
Altitude of the asteroid =
Mass of the asteroid =
Formula used:
Gravitation potential energy is defined as
Kinetic energy of an object is written as,
Calculation:
Consider the speed at which asteroid strike to the surface of moon is
By conservation of mechanical energy,
Now, let's plug all these values,
Conclusion:
Thus, the speed of the asteroid when it strikes to the surface of the moon is
(b)
The work done on asteroid by the moon when it strikes to the surface of the moon and stops there

Answer to Problem 46QAP
The work done on the asteroid during collision
Explanation of Solution
Given:
Mass of the asteroid =
Speed of the asteroid just before colliding with the surface of moon =
Speed of the asteroid after stopping =
Calculation:
Since, asteroid is coming to stop and its displacement inside the surface of moon is very small comparison to the radius of the moon. So, in this case, change in potential energy would be zero
Thus, total work done on the asteroid by the moon consumes in the change (loss) in kinetic energy.
Conclusion:
Thus, the work done on the asteroid by the moon is
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Chapter 10 Solutions
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