Which unit represents the most energy?
A) calorie
B) Calorie
C) joule
D) all the same
Answer: B
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You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure
A) 3 cm × 5 cm. B) 3 cm × 8 cm. C) 5 cm × 8 cm. D) Any pair of faces produces the same resistance.
The Doppler effect refers to changes in a sound wave's
A. amplitude caused by a change in speed of sound. B. amplitude caused by motion of a source or receiver. C. frequency caused by a change in speed of sound. D. frequency caused by motion of a source or receiver.
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?
Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
A) The 10-pound weight will hit the ground before the 5-pound weight. B) Both will hit the ground at the same time. C) Both weights will float freely, since everything is weightless on the Moon.