In the calculation of the centripetal forces in a nickel-based gas-turbine blade, the density of the blade at the operating temperature of 1000°C is needed. However, only the room-temperature density is available. Using the thermal expansion coefficient for nickel, estimate the density of nickel at 1000°C. You can assume that the expansion of the nickel in the turbine blade is isotropic.
What will be an ideal response?
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Astronomers can tell whether a light source approaches or recedes from Earth by
A) its temperature. B) its change in temperature. C) its absorption spectra. D) the Doppler effect. E) all of the above
Thin Lenses: A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A. -6.0 cm B. -7.5 cm C. -13 cm D. +18 cm E. +6.0 cm
A pure sample of 226Ra contains 3.0 × 10^14 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the activity of this sample?
a. 13 × 10^10 decays/yr c. 6.7 × 10^9 decays/yr b. 9.4 × 10^10 decays/yr d. 8.7 × 10^10 decays/yr
Answer the following statement(s) true (T) or false (F)
We can completely determine a q-vector’s components from an appropriate set of probability measurements