The resistivity of gold is 2.44 × 10-8 ? ? m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?
A) 0.030 mW
B) 0.0076 mW
C) 0.013 mW
D) 0.019 mW
E) 0.025 mW
A
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Nuclear Fission and Fusion: What is the meaning of the term "critical mass" in regard to nuclear fission?
A. This is the mass of the "critical" elements in a reactor, i.e., the uranium or plutonium. B. This is the minimum amount of fissionable material required to sustain a chain reaction. C. This is the amount of mass needed to make a power reactor economically feasible. D. This is the amount of material that is just on the verge of becoming radioactive.
Astronomers think that the inner core of Jupiter is composed mainly of ________.
A. helium B. rock and iron C. uranium D. hydrogen E. water
If a planet orbits the Sun at a distance of 4 AU, then its orbital period is 8 years
a. True b. False Indicate whether the statement is true or false
A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?
What will be an ideal response?