A negative ion is moving east near the equator where the Earth's magnetic field is horizontal to the north. The direction of the magnetic force on the ion is
A. north.
B. south.
C. up.
D. down.
E. not meaningful since the force is zero.
D. down.
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A star in the instability strip of the H-R diagram would:
A) vary in both temperature and radius. B) explode as a type I supernova. C) vary in temperature and brightness, but not in radius. D) vary in brightness with an irregular pattern. E) vary in temperature and radius, but not in brightness.
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?
Two point charges of + 30.0 ?C and - 9.00 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
A) 0.453 N directed towards the negative charge B) 2.45 N directed towards the negative charge C) 2.45 N directed towards the positive charge D) 245 N directed towards the positive charge E) 245 N directed towards the negative charge
If the accuracy in measuring the velocity of a particle increases, the accuracy in measuring its position will
A) increase. B) decrease. C) remain the same. D) It is impossible to say since the two measurements are independent and do not affect each other.