Earth's magnetic field is
A) something we've learned to live with.
B) useful to pigeons but not to humans.
C) protective to life on Earth.
Answer: C
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An object is dropped from rest on the planet Jupiter. At the end of 1 second, it has fallen 8 m and is moving at 16 m/s. What was its average speed during the entire first second [i.e., from t=0 until t=1 sec]?
A) 4 m/s B) 16 m/s C) 8 m/s D) 12 m/s E) None of the above.
A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron volts, between the two energy levels involved in producing this light?
A) 0.50 eV B) 0.65 eV C) 0.45 eV D) 0.60 eV E) 0.55 eV
What is the preferred name for Mg3N2?
a. Magnesium trinitride b. Magnesium nitride c. Dimagnesium trinitride d. Manganese nitrate
A horizontal rod (oriented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod
A) The west end of the rod is at higher potential than the east end. B) The east end of the rod is at higher potential than the west end. C) The top surface of the rod is at higher potential than the bottom surface. D) The bottom surface of the rod is at higher potential than the top surface. E) The potential is uniform across the rod.