Transformers: An ideal transformer steps down 120 V to 12. V and the 2630.-turn secondary supplies 12. A.(a) Determine the current in the primary.(b) Determine the turns ratio.(c) What is the ratio of output power to input power?
What will be an ideal response?
(a) 1.2 A (b) 1.0:10. (c) 1:1 for ideal transformer
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The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
We say that the Moon is gibbous when
A) it appears to be more than half illuminated, but not full. B) it appears to be less than half illuminated, but not new. C) it is exactly half illuminated. D) we see a thin crescent of light. E) the Moon is visible in the morning.
An FM radio station broadcasts at 96.7 MHz. What is the wavelength associated with this broadcast?
A) 3.1 m B) 0.32 m C) 2.9 × 1014 m D) 2.9 × 1016 m E) not enough information given
Which of these was NOT a part of the original Copernican model?
A) The Sun lies at the center of the solar system. B) Mercury must move faster in its orbit than any other planet. C) The Earth rotates on its axis once a day. D) Venus can go all the way around the Sun. E) Mercury speeds up at perihelion, and slows down at aphelion.