A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 ?. What is the average power loss?
a. 225 W
b. 450 W
c. 980 W
d. 1.12 kW
e. 900 W
b
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According to the nebular theory of solar system formation, which law best explains why the solar nebula spun faster as it shrank in size?
A) the law of conservation of angular momentum B) the law of conservation of energy C) the law of universal gravitation D) Einstein's law E = mc2
What do we mean when we say that a nucleus undergoes radioactive decay?
a. The mass of the nucleus is converted into high-energy X rays and gamma rays. b. The nucleus splits into two equal size pieces. c. The nucleus emits radio waves. d. The number of protons or neutrons (or both) in the nucleus changes.
A single slit, which is 0.050 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
A) 0.36° B) 0.47° C) 0.54° D) 0.63° E) 1.3°
At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10?15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10?25 kg.)
What will be an ideal response?