The Tully-Fisher relation exists between the galaxy's luminosity and its
A) age. B) mass. C) size. D) rotation. E) color.
D
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A dispersion-strengthened cutting tool will be made of a 80 vol % commercial purity nickel matrix and 20 vol % synthetic diamond. Nickel has an elastic modulus, given in Table 6.1, of 200 GPa and a tensile fracture strength of 400 MPa, and synthetic diamond has an elastic modulus of 900 GPa and a tensile fracture strength of 1000 MPa. Estimate the tensile strength and elastic modulus of this alloy.
What will be an ideal response?
Which of the following forms of electromagnetic radiation has a longer wavelength than visible light?
A) Gamma rays B) Ultraviolet radiation C) Infrared radiation D) X-rays
Find the average density of a red giant star with a mass of 20 × 1030 kg (approximately 10 solar masses) and a radius of 150 × 109 m (equal to the Earth's distance from the Sun).
A. 1.41 × 10?4 kg/m3 B. 0.007 kg/m3 C. 1.41 kg/m3 D. 710 kg/m3 E. 1.41 × 10?3 kg/m3
It is common to illustrate the density of nuclear matter be discussing the mass of a teaspoon of nuclear material. What do nuclear densities imply for the mass of a teaspoon (5 cm3) of nuclear material? You may wish to use the relationship r=(1.2 fm)A1/3 together with the mass of a proton, 1.67 x 10-27 kg, to estimate.
A. 3.8 x 1011 kg B. 9.6 x 1011 kg C. 1.53 x 1012 kg D. 1.15 x 1012 kg