The two types of bright nebulae are emission nebulae and _______________ nebulae
a. photonic
b. absorption
c. refraction
d. reflection
d
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The following steady-state stage II creep rates were recorded for a nickelbase superalloy at a constant tensile stress of 200 MPa.
It is known that the exponent of the stress in the creep-rate equation is n = 5.
(a) What would be the total stage II creep strain for this alloy at 913 K and a tensile stress of 200 MPa. in 1 year of service?
(b) Predict the stage II creep rate of this alloy at 891 K and a tensile stress of 300 MPa.
(c) Determine the enthalpy of activation for creep in eV/atom for this alloy.
In an electroplating process, copper (ionic charge +2e, atomic weight 63.6 g/mol) is deposited using a current of 10.0 A. What mass of copper is deposited in 10.0 minutes? Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C
A) 3.96 g B) 1.98 g C) 0.99 g D) 2.52 g E) 2.53 g
If the m = 2 fringe in Young's double-slit experiment occurs at an angle of 45.0°, what is the relationship between the wavelength l and the distance between slits, d?
a. d = 2.00l c. d = 1.41l b. d = 2.83l d. d = 4.00l
Which of these is an electronic instrument that can plot voltage as it varies with time?
A. An electroscope B. An oscilloscope C. An ammeter D. A galvanometer