A 4.0-kg mass has a velocity of 4.0 m/s, east when it explodes into two 2.0-kg masses. After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60° north of east. What is the magnitude of the velocity of the other mass after the explosion?
a. 7.9 m/s
b. 8.9 m/s
c. 7.0 m/s
d. 6.1 m/s
e. 6.7 m/s
C
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For a star of Sun-like mass, what is the last stage of the nuclear fusion?
a. Hydrogen to helium b. Helium to carbon and oxygen c. Carbon to magnesium d. Fusion goes all the way up to iron.
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1. The field at (0, 0, 1.0 m) is in the positive z direction. 2. The field at (0, 1.0 m, 0) is in the negative y direction. 3. The field at
(1.0 m, 0, 0) is zero. 4. The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these
A car accelerates from to at a constant rate of How far does it travel while accelerating?
A) 69 m B) 207 m C) 41 m D) 117 m
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?