A string with a mass/length of 0.00200 kg/m is stretched between two points with a tension of 120 N. If the fundamental frequency is 440 Hz, then what is the distance between the two points?
A. 17.5 cm
B. 20.3 cm
C. 27.8 cm
D. 30.0 cm
E. 35.0 cm
C. 27.8 cm
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Which of the following is true of planet Earth?
A) It has an atmosphere rich in water vapor. B) It has an atmosphere that is mainly composed of oxygen. C) It is the fourth largest planet of the Solar System. D) It is half the size of Jupiter.
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
As a protostar evolves from stage 4 to stage 6, it gets hotter but much less bright
Indicate whether the statement is true or false
As you jump up and down on a floor, the support force by the floor experiences
A) changes. B) no changes. C) none of the above.