Gravity acts over a limited distance range
Indicate whether the statement is true or false
F
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If the instantaneous velocity of an object is constant, then so is its
a. velocity. b. distance. c. acceleration. d. displacement.
Astronomers know what the solar interior is like by
A. constructing a miniature Sun in the laboratory and extrapolating the results to the real Sun. B. using locally tested physics combined with observations to build a mathematical model of what the Sun should be like in its interior. C. observing the interior directly. By using the appropriate filters, it is possible to reduce the bright glow of the Sun and to peer directly at the Sun's interior. D. sending probes directly into the Sun and sending back the information.
In ultrasound the _____________ of the sound is much greater than in normal sound
a. frequency b. period c. wavelength d. amplitude e. speed
The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them
A) also doubles. B) strengthens by a factor of 4. C) weakens by a factor of 4. D) weakens by a factor of 2. E) is unaffected.