An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25-m-long current is
A. 0.
B. 0.012 N, East.
C. 0.012 N, West.
D. 0.30 N, West.
E. 300 N, East.
Answer: D
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A system has an increase in internal energy of 60 J while 90 J was removed from the system by heat. How much work was involved during this process and was it done on the system or done on its environment?
a. 30 J on the system b. 30 J on the environment c. 150 J on the system d. 150 J on the environment
Which of the following are irregularities in our solar system that must be explainable in models of planetary formation?
A) Venus' low rate of rotation B) Mars' north-south asymmetry C) the tilt of Uranus' rotation axis D) binary Kuiper Belt objects E) All of the above
Maxwell guessed that visible light was an electromagnetic wave because of its:
a. energy. c. wavelength. b. frequency. d. speed.
In a diagram of charges and electric field lines charge Q1has twelve field lines going outward from it and charge Q2has three field lines going into it. If one of the charges is 100 nC, what is the other one?
a. 25 nC b. 100 nC c. –25 nC d. –100 nC e. Both answers b and c can be correct.