A top of rotational inertia 4.0 kg m2 receives a torque of 2.4 Nm from a physics professor. The angular acceleration of the body will be
A. 6.0 rev/s2.
B. 0.6 rad/s2.
C. 1.2 rev/s2.
D. 1.0 rad/s2.
E. 6.0 rad/s2.
Answer: B
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A solar collector design consists of several parallel tubes each enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with the inner and outer cylinder diameters of of 0.10 and 0.15 m respectively. The annular space between the tubes is filled with air at atmospheric pressure. Under operating condition the inner and outer tube surface temperatures are 70°C and 30°C respectively.
(a) What is the convective heat loss per meter of tube length?
(b) If the emissivity of the outer surface of the inner tube is 0.2 and the outer cylinder
behaves as though it were a black body, estimate the radiation loss.
(c) Discuss design options for reducing the total heat loss.
GIVEN
? Thin walled concentric tubes with air atmospheric pressure between them
? Inner tube diameter (Di) = 0.1 m
? Outer tube diameter (Do) = 0.15 m
? Inner tube temperature (Ti) = 70°C = 343 K
? Outer tube temperature (To) = 30°C = 303 K
? Outer surface emissivity of inner tube (E) = 0.2
FIND
(a) The convective loss pe meter of tube (qc/L)
(b) The radiative loss (qr/L)
(c) Discuss design options for reducing the total heat loss
ASSUMPTIONS
? Steady state
? Tubes are horizontal
SKETCH
PROPERTIES AND CONSTANTS
Fusing two carbon nuclei would occur with
A) absorption of energy. B) release of energy. C) neither of these
What is the change in entropy when 50 g of ice melt at 0°C?
A) 14.7 cal/K B) 4.0 kcal/K C) zero D) -4.0 kcal/K E) -14.7 cal/K
The Large Hadron Collider (LHC) near Geneva, Switzerland is an example of a
A) synchrotron. B) cyclotron. C) linear accelerator. D) None of the above