Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 10^4 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
a. measured by one clock fixed at one spot on Senesca.
b. measured by one clock fixed at one spot on the spaceship.
c. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting.
d. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting.
e. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.
b
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In the double-slit experiment with electrons, suppose that the observer uses a detector to determine through which slit the electron actually passes. Does this affect the outcome of the experiment, and why or why not?
A) No, the pattern on the screen remains an interference pattern, regardless of the detector. B) No, the pattern on the screen remains a non-interference pattern, regardless of the detector. C) Yes, the detector causes the pattern on the screen to suddenly change from an interference pattern [with no detector] to two tiny spots directly behind each slit [with the detector]. D) Yes, the detector causes the pattern on the screen to suddenly change from an interference pattern [with no detector] to a non-interference pattern [with the detector]. E) Yes, the detector causes the pattern on the screen to suddenly change from a non-interference pattern [with no detector] to an interference pattern [with the detector].
For what reasons do we consider the planets of the solar system to be of two fundamentally different types?
What will be an ideal response?
How far apart should two protons be if the electrical force of repulsion on each one is equal to its weight on the earth? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg)
What will be an ideal response?
What makes a gas cloud contract to form stars?
A. The cloud's magnetic field draws material together. B. All parts of the cloud are gravitationally attracted to all other parts, collapsing the cloud. C. Pressure from meteor collisions pushes the cloud together. D. The dust in the cloud is pulled together by static electricity. E. Uranium atoms attract lead atoms by nuclear fusion.