Nuclear Magnetic Resonance, NMR, is more commonly referred to as
A) MRI.
B) NRA.
C) CT-scan.
D) MRT.
E) CAT.
A
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The gravitational force in a molecular cloud depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) thermal pressure.
Which of the following radionuclides has the shortest half-life?
a. Potassium-40 b. Uranium-238 c. Carbon-14 d. Uranium-235
Electric Field of Point-Charges: What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 180,000 N/C B. 5100 N/C C. 1.8 × 1014 N/C D. -180,000 N/C E. -5100 N/C
A steel billet is to be heat treated by immersion in a molten salt bath. The billet is 5-cm-square and 1-m-long. Prior to immersion in the bath, the billet is at a uniform temperature of 20°C. The bath is at 600°C and the heat transfer coefficient at the billet surface is 20 W/(m2K). Plot the temperature at the center of the billet as a function of time. How much time is needed to heat the billet center to 500°C? Use an implicit difference scheme with node spacing of 1 cm. The thermal conductivity of the steel is 40 W/(m K) and the thermal diffusivity is 1 x 10–5 m2/s.
GIVEN Steel billet undergoing heat treatment FIND (a) Temperature at the center of the billet as a function of time (b) How much time is needed to heat the center of the billet to 500°C