What can we infer, at least roughly, from a star's luminosity class?
A) its age in years B) its surface temperature
C) its size (radius) D) its mass
C
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If two electrons are entangled, then
A) if one particle suddenly alters its wave packet, the other must also. B) both are part of a single matter wave. C) Both of the above. D) they must exert forces on each other. E) All of the above.
Circular Motion of Charges: A charged particle of mass 0.0040 kg is subjected to a 4.0-T magnetic field which acts at a right angle to its motion. If the particle moves in a circle of radius 0.10 m at a speed of 2.0 m/s, what is the magnitude of the charge on the particle?
A. 0.020 C B. 50 C C. 0.00040 C D. 2500 C
What is the quark structure of a proton?
a. uud b. udd c. uuu d. ddd e. the question does not make sense
If the earth's electric field is 100 N/C downward, what must be the charge on a 1-kg object so that it would be "weightless"?
A) 9.8 C B) 0.22 C C) 1.0 C D) -9.8 × 10-2 C E) 9.8 × 10-2 C