Which of the following correctly describes the conditions under which you will feel weightless, according to general relativity?
A) any time you are traveling through space at constant speed
B) any time your worldline is perfectly straight
C) any time your worldline is following the straightest possible path through spacetime
D) any time you are very far from any planet
E) You can never be truly weightless.
C
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Which of the following statements about scientific models is true?
A) A model can be used to explain and predict real phenomena. B) All current models are correct. C) A model tries to represent all aspects of nature. D) A model tries to represent only one aspect of nature. E) All models that explain nature well are correct.
A car travels along eastward with a constant velocity. The magnitude of the acceleration of the car is
A) decreasing. B) increasing. C) non-zero constant. D) zero. E) None of the other choices is correct.
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
A) electrons that surround the nucleus. B) neutrons in the nucleus. C) both of these D) none of the above
What is the energy of a photon of light of wavelength 4.80 × 10^–7 Hz? h = 6.63 × 10^–34 J?s and 1 eV = 1.6 × 10^–19 J
a. 144 eV b. 1.38 eV c. 2.59 eV d. 2.21 eV