A series RLC ac circuit has a capacitive reactance of 55
and inductive reactance of 25
and a resistance of 40
What is the impedance of this circuit?
A. 12
B. 95
C. 70
D. 10
E. 50
E. 50
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Majority of the mass of the galaxy's halo is made up of white dwarfs
Indicate whether the statement is true or false
As a leaf grows, it becomes more organized. Does this process violate the law of entropy?
A) Yes; in fact, it is known that the law of entropy does not apply to biological processes such as the growth of a leaf, or biological evolution. B) No, because total energy is conserved in this process, despite the increased organization of the leaf. C) No, because the radiation passing through the leaf during this process increases its entropy, so that the total entropy increases. D) No, because the O2 that is emitted during photosynthesis has greatly increased entropy, resulting in an overall increase of the total entropy. E) No, because the sugars and other molecules of the leaf are formed at a high temperature, resulting in an overall increase of the total entropy.
A charged particle having electric charge Q=4.0 e enters a region of magnetic field 1.2 T at an angle of 37 degrees relative to the magnetic field direction. If the speed of the particle upon entering the region is 2.8 x 104 m/s, what is the magnitude of the force on it?
a. 
b. 
c. 
d. 
e. 
f. 
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)