A primary current of 6.0 A exists in an ideal iron-core transformer at a primary voltage of 100 volts. If the current in the secondary is 0.75 A, calculate the output voltage
a. 12.5 V
b. 40 V
c. 400 V
d. 800 V
e. 200 V
d
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A solenoid of radius 1.1 cm produces a magnetic field at its center is 0.28 T. What is the magnetic flux through the center of the solenoid?
a. 
b. 
c. 
d. 
e. 
The star named Circini has the spectral type and luminosity class of O 8.5 V. Based on this information, which of the following are true? I. Circini has a surface temperature less than the sun. II. Circini has a diameter that is greater than that of the sun. III. Circini is more luminous than the sun. IV. Circini is located near the upper left hand corner in the HR diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV
The apparent magnitude of a star observed from a distance of 10 pc is called _____
Fill in the blank(s) with correct word
When using 529-nm light, how far is the adjustable mirror of a Michelson interferometer moved when 600 fringe shifts are counted? A fringe shift occurs when the intensity goes from bright to dark or when it goes from dark to bright
a. 1.58 × 10^-4 m c. 9.90 × 10^-6 m b. 7.94 × 10^-5 m d. 3.97 × 10^-5 m