The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A) It is increased by a factor of 2.
B) It is increased by a factor of 4.
C) It is reduced by a factor of 2.
D) It is reduced by a factor of 4.
E) It is reduced by a factor of 8.
D
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A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fifth mode?
A. 30.3 cm B. 26.7 cm C. 21.2 cm D. 17.1 cm E. 12.3 cm
A(n) ______________ converts mechanical energy into electrical energy
Fill in the blank(s) with correct word
The rings of Uranus were discovered ____________
a. during an occultation of a star by the rings (as well as by the planet). b. during an eclipse of one of the moons by the rings. c. during a voyage to Uranus by astronauts d. as Uranus and the rings passed behind Jupiter. e. during an encounter by the Voyager 1 space probe.
The best places for life to have formed on Earth are believed to have been
a. near the south pole in places where water is frozen solid as ice. b. on the continent of Africa in the areas with no water. c. in liquid water, probably in the oceans or pools of water.