Carbon-14 decays by ?- emission. What nucleus is left after this decay?
A) carbon-13
B) carbon-14
C) carbon-15
D) nitrogen-14
E) nitrogen-15
D
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Copernicus' model was significantly better at predicting future positions of planets than Ptolemy's.
Answer the following statement true (T) or false (F)
A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor
a. 0.96 mT b. 1.7 mT c. 0.55 mT d. 1.2 mT e. 0.40 mT
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.)
a. 242 b. 238 c. 240 d. 236 e. 234
An airplane with a wingspan of 60.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.400 × l0-4 T. If the induced potential between wingtips is 0.600 V, what is the plane's speed?
a. 338 m/s c. 250 m/s b. 375 m/s d. 417 m/s