An isolated, submarine, volcanic peak on the ocean floor is called, in general, a(n) ______________
Fill in the blank(s) with correct word
seamount
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A large body of nonluminous gas at a temperature of 1100°C has emission bands between 2.5 and 3.5 ?m and between 5 and 8 ?m. At 1100°C, the effective emittance in the first band is 0.8 and in the second 0.6. Determine the emissive power of this gas in W/m2.
GIVEN
• A large body of nonluminous gas
• Gas temperature (T) = 1100°C = 1373 K
• Emission bands: 2.5 ?m < ?1 < 3.5 ?m 5 ?m < ?2 < 8 ?m
• Effective emittances: ?1 = 0.8; ?2 = 0.6
FIND
• The emissive power (E) in W/m2
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Refer to Figure 6-13. Block A has a mass of 3.00 kg, block B has a mass of 5.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A. 4.20 m/s2 B. 4.71 m/s2 C. 1.86 m/s2 D. 2.94 m/s2 E. 0.981 m/s2
A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens. Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107 s, h = 6.626 × 10-34 J ? s)
(a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm? What will be an ideal response?
List reasons that might explain
a. the success of some invading species. b. the failure of other invading species.