Which of the following statements best explains why the planets orbit in nearly a single plane and in the same direction around the Sun?
A) The planets all rotate in same direction as they orbit.
B) The Sun rotates in the same direction, and spun out the planets as it formed.
C) The planets formed from a disk of rotating gas.
D) It's a mysterious coincidence: the planets form randomly, so it's a puzzle how they orbit that way.
C
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Torque: A flat circular loop of wire is in a uniform magnetic field of 0.30 T. The diameter of the loop is 1.0 m, and a 2.0-A current flows in it. What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the magnetic field?
A. 0.00 N ? m B. 0.41 N ? m C. 0.47 N ? m D. 0.52 N ? m
What does it mean when a website has the https:// protocol designation?
A. The website uses SSL to transmit customer's data. B. The website has been spoofed. C. The website uses a digital signature. D. The website does not use cookies.
What potential difference is required to cause 4.00 A of current through a resistance of 330 ??
A) 12.1 V B) 82.5 V C) 334 V D) 1320 V
The temperature of outer space is
A) zero. B) about 2.7 kelvin. C) meaningless. D) none of the above