You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor
How many windings should the secondary circuit contain?
22
Physics & Space Science
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The type of radiation that fogged Becquerel’s photographic plates was probably
A. Alpha radiation. B. Beta radiation. C. Gamma radiation. D. Either alpha or beta radiation. E. Either beta or gamma radiation.
Physics & Space Science
A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
A. 5.7 B. 4.6 C. 6.5 D. 7.2 E. 3.6
Physics & Space Science
A beam of light travels a distance of 2900 m. How much time does it take?
A) 9.7 s B) 9.7 ms C) 9.7 ?s D) 9.7 ns E) 9.7 ps
Physics & Space Science
The intensity of a 70-dB whistle is doubled. What is the new decibel level?
Physics & Space Science