A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/
A)
A) 4.7 µT
B) 6.4 µT
C) 20 µT
D) 56 µT
C
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A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the relative velocity of the 1st package viewed from the second will
A) depend upon their weight. B) be constant. C) increase. D) decrease. E) be zero.
If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction?
(1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg) A) 0.35 kg B) 1.75 kg C) 390 kg D) 1.1 × 108 kg E) 3.3 × 108 kg
Which space mission orbited Jupiter and dropped a probe into Jupiter's atmosphere?
a. Pioneer b. Voyager c. Galileo d. Cassini e. New Horizons
The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that
A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood. B) the ax-handle is about 18,000 years old. C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today. D) the ax-handle is about 12,000 years old. E) the ax-handle is about 48,000 years old.