Why should the experimenter avoid using the end of a meter stick when making a measurement?
The end of the meter stick is usually damaged and thus becomes unreliable as a
reference point.
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An AC power generator produces 42.9 A (rms) at 2 970 V. The voltage is stepped up to 6 000 V by an ideal transformer, and the energy transmitted through a long-distance power line with a total resistance of 100 ?. What is the rms current in the long-distance line?
a. 87 A b. 21.2 A c. 42.9 A d. 30.2 A e. 61.0 A
The analysis of Martian rocks on Earth show that they contain
A) tantalizing but unconfirmed hints of life. B) bacteria with closely related DNA to bacteria on Earth. C) bacteria with very different DNA from bacteria on Earth. D) water ice. E) chemical byproducts of life.
Which of the following are active galaxies?
A. quasars B. radio galaxies C. Seyfert galaxies D. All of these choices are correct.
A hydrogen atom is excited to the n = 10 stated. It then decays to the n = 4 state by emitting a photon which is detected in a photographic plate. What is the frequency of the detected photon? The lowest level energy state of hydrogen is -13.6 eV
(h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 4.05 × 1014 Hz B) 1.73 × 1014 Hz C) 1.27 × 1014 Hz D) 0.865 × 1014 Hz E) 3.46 × 1014 Hz