As an object moves from point A to point B only two forces act on it: one force is conservative and does ?70 J of work, the other force is nonconservative and does +50 J of work. Between A and B,
a. the kinetic energy of object increases, mechanical energy increases
b. the kinetic energy of object decreases, mechanical energy increases.
c. the kinetic energy of object decreases, mechanical energy decreases.
d. the kinetic energy of object increases, mechanical energy decreases.
e. None of the above.
b
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Capacitors in Combination: Three identical capacitors are connected in series across a potential source (battery). If a charge of Q flows into this combination of capacitors, how much charge does each capacitor carry?
A. 3Q B. Q C. Q/3 D. Q/9
As a parcel of air at high altitude sinks to a lower elevation with no heat input or output, its temperature
A) increases. B) decreases. C) will remain unchanged.
Annie Jump Cannon became famous for
A) developing our modern system for classifying stars. B) discovering the planet Uranus. C) discovering the planet Neptune. D) building the world's largest telescope.
What can we learn about a star from a life track on an H-R diagram?
A) the star's age B) the surface temperature and luminosity the star will have at each stage of its life C) the star's current stage of life D) how the star's distance from Earth varies at different times in its life