If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, the electromagnetic forces they exert on each other will be
A) magnetic but not electric. B) electric but not magnetic.
C) zero. D) both electric and magnetic.
B
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In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the earth using a pendulum 11.0 m long, which was set up in the Paris Observatory
How long would it have taken for Foucault's pendulum to make one complete swing back to its starting point if g = 9.81 m/s2 at the observatory? A) 6.65 s B) 5.63 s C) 1.79 s D) 2.12 s E) 2.58 s
In the context of star clusters, which of the following statements is true of the turnoff point?
A) It is the point on the main sequence of a Hertzsprung-Russell diagram that is used to determine the luminosity class of the stars in the cluster. B) Stars at this point are considered to have just taken birth and have 90 percent of their life remaining. C) The life expectancy of the stars at this point is not equivalent to the age of the cluster. D) It is the point on the main sequence of a Hertzsprung-Russell diagram where stars evolve to the right of the H-R diagram to become giants.
A book is resting on a table. How many forces would be in the free-body diagram of the book?
a. one b. two of the same type c. two of different types d. three or more of the same type e. three or more of at least two different types
Capacitors of values 1.0 F, 2.0 F, 3.0 F, and 6.0 F are connected in series across a 12 V power supply. Which capacitor has the greatest potential difference across it?
A. the 1.0 F capacitor B. the 2.0 F capacitor C. the 3.0 F capacitor D. the 6.0 F capacitor E. they all are equal