You have to select a material as a coating on an aluminum part that improves the wear and abrasion resistance of the part. What class of material would you investigate first for suitability?
What will be an ideal response?
ceramics
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The classification of stellar spectra started with the amount of hydrogen in the star's spectrum; however, now a better scheme uses the star's _____
a. mass b. diameter c. radius d. temperature e. luminosity
What observation made of other stars seems to suggest the solar nebula hypothesis is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low mass red dwarfs. d. Young stars are found to have hot disks that surround them.
Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c
A long wire carries a current of 3.0 A along the axis of a long solenoid (radius = 3.0 cm, n = 900 turns/m, current = 30 mA). What is the magnitude of the magnetic field at a point 2.0 cm from the axis of the solenoid? Neglect any end effects
a. 34 mT b. 64 mT c. 30 mT d. 45 mT e. 4.0 mT