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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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
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
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
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