A certain ideal gas has a molar specific heat at constant volume Cv = 7R/5. What is its molar specific heat at constant pressure?
A) 12R/5
B) 7R/3
C) 12R/7
D) 12R/5
E) 4R
A
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An iron block of density ?Fe and of volume l3 is immersed in a fluid of density ?fluid. The block hangs from a scale which reads w as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is
a. w = (?Fe ? ?fluid)ghl2. b. w = (?fluid ? ?Fe)gl3. c. w = (?Fe ? ?fluid)gl3. d. w = (?Fe + ?fluid)ghl2. e. w = (?Fe + ?fluid)gl3.
A piezoelectric actuator is being produced for a scanning tunneling microscope. The piezoelectric actuator is to be 1×10-3 m in length and produced from barium titanate, which has a dielectric breakdown strength of 6×106 V/m. The piezoelectric strain coefficient of the barium titanate is 1.9×10-10 m/V. Assume that the maximum electric field that can be applied to the piezoelectric material is 1×106 V/m.
(a) What is the required voltage to produce an atomic-scale displacement of 0.1 nm? (b) What is the displacement produced by 1000 V? (c) With 1000 V applied, is the piezoelectric safe from dielectric breakdown?
A conducting rod (length = 80 cm) rotates at a constant angular rate of 15 revolutions per second about a pivot at one end. A uniform field (B = 60 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the emf induced between the ends of the rod?
a. 2.7 V b. 2.1 V c. 2.4 V d. 1.8 V e. 3.3 V
In radio galaxies, the main source of radio emissions is a small region at the center of the galaxy.
Answer the following statement true (T) or false (F)