A substance that speeds up a chemical reaction but is not consumed is a(n) ______________
Fill in the blank(s) with correct word
catalyst
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Reconsider the problem of cooling of a rotating rod (shaft) by natural convection described in Example 8.6. Determine the shaft rotation at which the heat transfer contribution due to the rotation convection is about the same as that due to natural convection, and calculate the total heat transfer rate at this condition. Also, graph the variation of q, as well as its two components (qr and qnc) with shaft rpm ranging from 3 rpm to 15 rpm, and comment upon the results.
GIVEN
? Cooling of rotational shaft by natural convection
? Rod diameter (D) = 20 cm = 0.2 m
? Air temperature (T?) = 20°C
? Temperature of rotating rod (Tb) = 1000°C
FIND
? Shaft rotation at which heat transfer contribution due to rotational convection is same as that due
to natural convection.
? Total heat transfer rate at this condition.
? Graph of variation of q and qr and qnc with shaft rpm.
ASSUMPTIONS
? Radiation is negligible
? The shaft is horizontal
PROPERTIES AND CONSTANTS
If an observer walks north toward increasing latitude, the number of circumpolar stars would
a. remain constant. b. decrease. c. increase. d. Unknown unless you also state the longitude of the observer.
A parallel plate capacitor has a potential difference between the plates of 80 V. If the charge on one of the plates of the capacitor is +8.0 ?C, what is the electrical energy stored by this capacitor?
A) 640 × 10-6 J B) 320 × 10-6 J C) 5.0 × 10-8 J D) 6.0 × 10-8 J E) 3.0 × 10-8 J
What will you see with the following type of optic: Concave mirror
A. Image is smaller |
B. Image is the same |
C. Image is larger |