An astronaut is on a 100-m lifeline outside a spaceship, circling the ship with an angular speed of 0.100 rad/s. How far inward can she be pulled before the centripetal acceleration reaches 4g = 39.2 m/s2?
a. 50.0 m b. 70.6 m
c. 72.7 m d. 89.9 m
b
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The dynamo effect is believed to produce the ____________________ of the Sun
Fill in the blank(s) with correct word
The ordered structure NiAl has been investigated as a high-temperature gas-turbine material; however, brittle fracture is a problem with this alloy. Theoretical calculations have determined that the enthalpy of the ordered NiAl structure is 0.15 eV per atom less than for a disordered structure. The NiAl ordered structure is a cube with Ni at 0,0,0 and Al at 1/2,1/2,1/2.
(a) What is the Bravais lattice type for NiAl? (b) What is the GFE change if this alloy disorders at 1900 K? (c) Based upon your result for (b), predict if NiAl is ordered or disordered at 1900 K. (d) From the Ni-Al phase diagram in Figure 5.15, to what temperature does the NiAl phase remain ordered?
How are rotation curves of spiral galaxies determined for orbital distances beyond where starlight can be detected?
A) by extrapolation of the measured rotation curve B) by observations of the 21 cm line of atomic hydrogen C) by observations of spectral lines emitted by dark matter D) by watching the galaxies rotate over a period of decades E) by measuring the broadening of the galaxy's absorption lines
In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?
A) 0° B) 45° C) 90° D) 180° E) none of the given answers