Which of the following statements is not true about the sky at Earth's equator?
A) Over the course of the year, all 88 constellations will at some point be visible in the evening sky.
B) There are no circumpolar stars in the equatorial sky.
C) The Sun will pass directly overhead around noon each day.
D) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby).
C
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According to the solar nebula theory, Earth and the other planets of the Solar System formed billions of years ago as the Sun _______________ from a cloud of interstellar gas and dust
Fill in the blank(s) with correct word
Friction: An object slides on a level floor. It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2. What is the coefficient of kinetic friction between the object and the floor?
A. 0.24 B. 0.48 C. 0.12 D. It is impossible to determine without knowing the mass of the object.
Imagine that you feed alternating current to an inductor with high inductance and very low resistance. Suppose we slowly increase the frequency of this alternating current while keeping the amplitude ?0 of the applied emf constant. How does the amplitude i0 of the alternating current flowing in the coil change (or does it)?
A. 25,000 B. 4000 C. 2500 D. 40 E. 25 F. Some other result (specify). T. One needs more information to answer.
Which of the following is true about a diode?
a. A diode causes the voltage to shift in phase by 90°, i.e., a right angle. b. A diode has high resistance in one current direction and low resistance in the opposite current direction. c. A diode can only be used with a transformer. d. All filter circuits contain a diode. e. All of the above.