Which forming technique is best suited to producing cobalt-tungsten carbide cutting tools?
(a) Hot isostatic pressing of powder
(b) Investment casting
(c) Forging
(d) Superplastic forming
(a) Hot isostatic pressing of powder
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In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 55.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch
If the distance between the wheel and the mirror is 8800 m, how much time does it take the wheel to rotate from one notch to the next? A) 11.9 s B) 24.8 s C) 3.83 × 10-5 s D) 7.44 × 10-5 s E) 8.44 × 10-5 s
Compared to natural background radiation, the amount of radiation received by U.S. citizens from normally operating nuclear power plants is
A) about 10% as much. B) very much less. C) roughly the same amount. D) absolutely zero. E) considerably more.
A conducting rectangular loop of mass M, resistance R, and dimensions a×b is allowed to fall from rest through a uniform magnetic field which is perpendicular to the plane of the loop. The loop accelerates until it reaches a terminal speed (before the upper end enters the magnetic field). If a = 2.0 m, B = 6.0 T, R = 40 ?, and M = 0.60 kg, what is the terminal speed?
A. 1.6 m/s B. 20 m/s C. 2.2 m/s D. 26 m/s E. 5.3 m/s
A radiation source is to be built, as shown in the diagram, for an experimental study of radiation. The base of the hemisphere is to be covered by a circular plate having a centered hole of radius R/2. The underside of the plate is to be held at 555 K by heaters embedded in its surface. The heater surface is back. The hemispherical surface is well-insulated on the outside. Assume gray diffuse processes and uniform distribution of radiation. (a) Find the ratio of the radiant intensity at the opening to the intensity of emission at the surface of the heated plate. (b) Find the radiant energy loss through the opening in watts for R = 0.3 m. (c) Find the temperature of the hemispherical surface.
GIVEN
• A radiation source as shown above
• Radius of hole = R/2
• Temperature of underside of plate (T2) = 555 K
• Underside of plate is black
• Hemispherical surface is well insulated on the outside
FIND
(a) The ratio of the radiant intensity at the opening to the intensity at the surface of the heated plate (G1/ Eb2)
(b) The radiant energy loss through the opening (q1) in watts for R = 0.3 m
(c) The temperature of the hemispherical surface (T3)
ASSUMPTIONS
• Gray diffuse processes
• Uniform distribution of radiation
• Radiation entering A1 is negligible, i.e., A1 as a black body at 0 K Heat loss through insulation is negligible
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)