How much kinetic energy must a deuterium ion (charge 1.6 × 10^-19 C) have to approach to within 10-14 m of another deuterium ion? (1 MeV = 1.6 × 10^-13 J)
140 keV
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An object is moving in a circular path of radius 4.00 m. If the object moves through an angle of 1.2 radians, then the tangential distance traveled by the object is
A. 2.8 m. B. 3.2 m. C. 3.8 m. D. 4.3 m. E. 4.8 m.
The superposition of two waves, 
and 
,results in a wave with a frequency of
A. 85 Hz. B. 170 Hz. C. 85? Hz. D. 340 Hz. E. 170? Hz.
Earth's magnetic field affects cosmic rays by
A) deflecting them. B) slowing their speeds. C) destroying them. D) absorbing them.
In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.50 km?
A) 157 m/s B) 314 m/s C) 78.5 m/s D) 255 m/s E) 510 m/s