Graphical Interpretation of Work: The net force that an animal exerts on a large piece of fruit it has found is observed and is shown in the graph in the figure. If the force is parallel to the motion of the fruit, how much work did the animal do during the encounter?
A. 12.5 J
B. 50 J
C. 25 J
D. 22 J
E. 0 J
Answer: C
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The density of a neutron star is comparable to the density of an atomic nucleus
Indicate whether the statement is true or false
The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because:
A) Mercury is low in iron. B) Mercury spins to rapidly to produce a stable dynamo. C) It's still too hot for its core to have differentiated. D) The dynamo theory predicted that Mercury was spinning too slowly for one. E) Mercury lacks an iron core.
When a substance is exposed to something that has a lower temperature,
a. work is done on it. b. work is done by it. c. heat is transferred from it. d. heat is transferred to it. e. none of the above.
Which of the following best explains why the Sun's luminosity gradually rises over billions of years?
A) Fusion gradually decreases the number of independent particles in the core, allowing gravity to compress and heat the core, which in turn increases the fusion rate and the Sun's luminosity. B) Nuclear reactions in the Sun become more efficient with time, so that each fusion reaction releases more energy when the Sun is old than when it is young; this in turn raises the Sun's luminosity. C) The Sun's core gradually expands with time, and this expansion means there is more room for energy to be generated and hence increases the Sun's luminosity. D) The planets need more and more energy to maintain any life on them as time goes on, and therefore the Sun must bet hotter.