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Tutor profile: Sehej S.

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Sehej S.
Aerospace Engineer, previously @ NASA, JPL
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Questions

Subject: Mechanical Engineering

TutorMe
Question:

What is the difference between a bushing and a bearing?

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Sehej S.
Answer:

Bearings are used to allow a shaft free rotational motion via rolling contacts by bearings. Bushings on the other hand allow free linear motion along a shaft via sliding contact by the bushing on the shaft.

Subject: Aerospace Engineering

TutorMe
Question:

Describe some considerations you would make in designing a heat exchanger to be used downstream of a conventional ramjet (with shock cone) for an aircraft traveling at Mach 5 speeds.

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Sehej S.
Answer:

Besides conventional limitations on the rocket equation and vehicle thrust by gross mass: - Rate of heat exchanged between materials varies based on HX geometry, air flow conditions, and working fluid characteristics. - Based on the conditions specified, a large delta bulk temperature between fluids is expected, thus the NTU-effectiveness method is proposed instead of LMTD.

Subject: Physics

TutorMe
Question:

You are given a flat disk and ring with the same thickness, outside diameter, and mass. You set both on a track to fall at a 45deg incline. Which will reach the bottom first and why?

Inactive
Sehej S.
Answer:

The disk reaches the bottom in nearly half the time it takes the ring. This is because it has half of the moment of inertia (Idisk = 0.5mr^2) vs (Iring = mr^2).

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