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Chapter 10: Problem 81

If the sample tubes are made longer, the rotational inertia of the centrifuges with sample tubes inserted will a. remain the same. b. increase. c. decrease.

Short Answer

Expert verified
Hence, as the sample tubes are made longer, the rotational inertia of the centrifuges with sample tubes inserted will increase.

Step by step solution

01

Understanding the concept

Rotational inertia, also known as the moment of inertia, depends on not only the mass of the object, but also how this mass is distributed relative to the axis of rotation. If the mass is distributed farther from the axis, the moment of inertia is larger.
02

Apply concept to problem

In the case of sample tubes in a centrifuge, if the tubes are made longer this will distribute some of the mass of the tubes (and any samples within them) farther from the axis of rotation in the centrifuge.
03

Determine the effect on rotational inertia

Since the mass of the tubes (and any samples within them) is now distributed farther from the axis of rotation, this would increase the rotational inertia of the centrifuge with sample tubes inserted.

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