A combination of a 2.0-? resistor in series with 4.0-? resistor is connected in parallel with a 3.0-? resistor. What is the equivalent resistance of this system?
A) 2.0 ?
B) 3.0 ?
C) 4.0 ?
D) 9.0 ?
A
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Why is the cosmic microwave background (CMB) so cold if the early Universe was so hot?
a. Enough time has passed for matter in the universe to release enough heat to cool down. b. The CMB constantly interacts with atoms, which effectively cool down the photons. c. The expansion of the Universe has redshifted those photons to an effectively cooler temperature. d. Misleading; The big bang was initially hot but the CMB was released from cold material much later on.
A small steel sphere falls with a terminal velocity in a viscous fluid of 2.00 cm/s. If the radius of the steel sphere is doubled, then what is the terminal velocity of the sphere?
A. 1.00 cm/s B. 2.00 cm/s C. 4.00 cm/s D. 6.0 cm/s E. 8.00 cm/s
Unlike spherical mirrors, spherical lenses do not have a focal length equal to ______________
Fill in the blank(s) with correct word
The term "timbre" refers to which of the following?
a. Any musical instrument made primarily of wood. b. The quality of sound from instruments due to the mixture of harmonics. c. Instruments that have valves. d. An instrument made in France.