The Earth's circumference was first determined by:
A) Aristotle using lunar eclipses.
B) Pythagoras with geometry.
C) Hipparchus with stellar parallaxes.
D) Erastothenes with solstice shadows.
E) Aristarchus with first and third quarter Moon timings.
D
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Which is a reasonable restatement of the second law of thermodynamics?
a. The orderliness of the universe increases. b. All heat engines exhaust heat to their surroundings. c. Force equals mass times acceleration. d. Single-temperature heat engines can be built. e. Heat sometimes flows spontaneously from colder to warmer objects.
A transistor is an example of a
A) resistor. B) superconductor. C) semiconductor. D) dry cell. E) transmitter.
When Rutherford directed a stream of alpha particles at a gold foil, some particles
A) bounced back. B) continued through the foil. C) deflected at a variety of angles. D) all of the above E) none of the above
A parallel plate capacitor is constructed with plate area of 0.40 m2 and a plate separation of 0.10 mm. How much charge is stored on it when it is charged to a potential difference of 12 V?
What will be an ideal response?