A high-voltage powerline operates at 500,000 V rms and carries an rms current of 500 A. If the resistance of the cable is 0.050 ?/km, what is the resistive power loss in 200 km of the powerline?
A. 250 kW
B. 500 kW
C. 1 megawatt
D. 2.5 megawatts
E. 250 megawatts
Answer: D
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Given that white dwarf supernovae are such good standard candles, why don't we use them to measure the distance to all galaxies?
A) They are rare events, so we have observed them in only a tiny fraction of all galaxies. B) They can occur only in spiral galaxies, not elliptical galaxies. C) We would, but we don't have enough telescopes. D) We cannot see them beyond a distance of about 100 million light-years.
A cylinder containing an ideal gas has a volume of 3.0 m3 and a pressure of 1.0 × 10^5 Pa at a temperature of 300 K. The cylinder is placed against a metal block that is maintained at 900 K and the gas expands as the pressure remains constant until the temperature of the gas reaches 900 K. The change in internal energy of the gas is 9.0 × 10^5 J. Find the change in entropy of the block
associated with the heat transfer to the gas. a. 0 c. -1700 J/K b. +670 J/K d. -1100 J/K
Identifying Groups and Periods Which elements have similar behavior?
a. barium b. silicon c. aluminum d. strontium e. osmium f. beryllium
The electric potential at a point P due to a positive charge is along the direction of that charge
Indicate whether the statement is true or false