A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?
A) 30° B) 60° C) 90° D) 25° E) 35°
A
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The element most abundant in the Sun is oxygen
a. True b. False Indicate whether the statement is true or false
Alpha particles (charge = +2e, mass = 6.68 × 10-27 kg, e = 1.60 × 10-19 C) are accelerated in a cyclotron to a final orbit radius of 0.90 m. The magnetic field in the cyclotron is 0.30 T
The period of the circular motion of the alpha particles is closest to A) 0.44 ?s. B) 0.67 ?s. C) 0.87 ?s. D) 1.1 ?s. E) 1.3 ?s.
Which of the following statements about spectral types of stars is not generally true?
A) The spectral type of a star can be determined by identifying lines in its spectrum. B) The spectral type of a star can be used to determine its surface temperature. C) The spectral type of a star can be used to determine its color. D) The spectral type of a star can be used to determine its distance.
Three stars, Deneb in Cygnus, Altair in Aquila, and Vega in Lyra, are among the brightest in the summer sky. What are they sometimes called?
A) the Zenity Triad B) the Meridian Triad C) the Summer Triangle D) the Luminous Constellations E) the Zodiac Triad