The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 70 V B) 30 V C) 100 V D) 400 V E) 480 V
E
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Most supermassive black holes are dormant
a. True b. False Indicate whether the statement is true or false
Matter Waves: What is the wavelength of the matter wave associated with an electron moving with a speed of 2.5 × 107 m/s? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 29 pm B. 35 pm C. 47 pm D. 53 pm
A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having a density of 0.80 that of water, what new bottom pressure results?
a. a pressure < P b. the same pressure P c. a pressure > P d. This is unable to be determined with the information given.
Which of the following processes is consistent with the law of conservation of four-momentum? a) A particle moving eastward collides with and sticks to an identical particle at rest. The resulting single particle remains at rest but is more massive than the sum of the original particles’ masses.
A. C B. F