According to the universal law of gravitation, the force due to gravity is
A) not dependent on the distance between objects.
B) directly proportional to the distance between objects.
C) directly proportional to the square of the distance between objects.
D) inversely proportional to the distance between objects.
E) inversely proportional to the square of the distance between objects.
E
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Which of the following telescopes is most suitable for observing cool gas clouds?
A. radio telescope B. visible-light telescope C. X-ray telescope D. All of these choices are correct. E. Cool gas clouds cannot be observed by telescopes.
A glider on an air track is connected by a spring to the end of the air track. If it is pulled 3.5 cm in the +x direction away from its equilibrium point and then released from rest at t = 0, what is the initial phase ?
A. 0
B. 
C. 
D. 
E. 
F. Some other result (specify)
The chromosphere is the layer of the Sun that we see as its visible surface
Indicate whether the statement is true or false
A historical science: Scientists in many fields can test their hypotheses by proposing and carrying out experiments in which they can change variables in a controlled fashion
Astronomers, however, cannot adjust the properties of the objects they study. In what sense, then, can astronomers still conduct experiments?