A series circuit consists of a 50-Hz ac source, a 50-? resistor, a 0.50-H inductor, and a 60-?F capacitor. The rms current in the circuit is measured to be 3.1 A
What is the voltage amplitude of the source?
A) 510 V
B) 270 V
C) 220 V
D) 180 V
E) 160 V
A
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An example of conservation of angular momentum is
A. A car going around a corner B. An ice skater changing the speed of a spin C. Jumping off a diving board D. A golf club hitting a golf ball
A journal bearing is idealized as a stationary flat plate and a moving flat plate that moves parallel to it. The space between the two plates is filled by an incompressible fluid. Consider such a bearing with the stationary and moving plates at 10°C and 20°C respectively, the distance between them is 3 mm, the speed of the moving plate is 5 m/s, and there is engine oil between the plates.
(a) Calculate the heat flux to the upper and lower plates
(b) Determine the maximum temperature of the oil.
GIVEN
Journal bearing: Two flat plates, one stationary, one moving with oil between them
Stationary plate temperature (Ts) = 10°C
Moving plate temperature (Tm) = 20°C
Distance between plate (H) = 3 mm = 0.003 m
Speed of the moving plate (Up) = 5 m/s
FIND
(a) Heat flux (q/A) for the plates
(b) The maximum temperature of the oil
ASSUMPTIONS
Steady state
Constant physical properties
Negligible edge effects
Oil is incompressible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 17, for engine oil at 15°C
Thermal conductivity (k) = 0.145 W/(m K)
Absolute viscosity (?) = 1.561 (Ns)/m2
Prandtl number (Pr) = 196
During various stages of evolution, low mass stars (like the Sun) differ significantly from high mass stars. How and why are the main sequence lifetimes different?
What will be an ideal response?
Suppose we put 20 non-interacting quantons into a one-dimensional box of length L. The quantons quickly settle into the lowest possible energy states available. Roughly how many times larger will the quantons’ total energy be if they are fermions as opposed to bosons?
A. About the same B. About 4 times C. About 10 times D. About 40 times E. About 400 times