When it is noon in Toledo, about what time is it in Perth, Australia?
What will be an ideal response?
Midnight
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The four fundamental forces in nature are the __________, __________, __________, and __________
Fill in the blank(s) with correct word
The Universe has____
a. an edge, does not have a center, and is finite b. no edge, does not have a center, and is finite c. an edge, has a center, and is finite d. an edge, has a center, and is infinite e. no edge, does not have a center, and is infinite
A horizontal disk 1 m in diameter rotates in air at 25°C. If the disk is at 100°C, estimate the number of revolutions per minute at which natural convection for a stationary disk becomes less than 10% of the heat transfer for a rotating disk.
GIVEN
? A rotating horizontal disk in air
? Diameter (D) = 1 m
? Air temperature (T?) = 25°C
? Disk temperature (Ts) = 100°C
FIND
? The rotational speed (w) at which natural convection becomes less than 10% of the thermal effects
of rotation
ASSUMPTIONS
? Steady state conditions
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the mean temperature of 62.5°C
Radio telescopes which use dishes to gather radio waves are _______ telescopes
a. reflecting b. refracting c. deflecting d. compound e. retracting