A power transmission line 50. km long has a total resistance of 0.60 ?. A generator produces 100. V at 70. A
In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. (a) What percentage of the original energy is lost when the transformer is used? (b) What percentage of the original energy would be lost if the transformer were not used?
(a) 0.0042%
(b) 42%
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Dielectrics: A parallel-plate capacitor with plate separation of 4.0 cm has a plate area of 6.0 × 10-2 m2.What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling the space? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 3.7 × 10-12 F B. 3.7 × 10-14 F C. 16 × 10-14 F D. 32 × 10-14 F E. 32 × 10-12 F
This painting shows an object colliding with Earth. What is thought to have happened as a result of this collision?
A) It blasted away debris that then accreted in Earth orbit to form the Moon. B) It led to the extinction of the dinosaurs. C) The impact released the heat that allowed Earth to undergo differentiation. D) The impact changed Earth's orbit from one on which life would have been unlikely to our current orbit in which life flourishes.
All of the jovian planets rotate more rapidly than any of the terrestrial planets
Indicate whether the statement is true or false
The energy levels of an element and its ions are the same
Indicate whether the statement is true or false