When one compares the relativistic kinetic energy to the classically calculated kinetic energy for a moving object, at which of the speeds listed below does the classical calculation give a greater value than the relativistic calculation?
a. 0.707c
b. 0.5c
c. 0.2c
d. None of the above values will give such a result.
D
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An alternative statement of the uncertainly principle tells us that we cannot know precisely both
A) a particle's energy and the time during which it has this energy. B) a particle's mass and energy. C) whether a particle is a wave or whether it is truly a particle. D) a particle's momentum and its energy.
The low average densities of Jupiter and Saturn compared with Earth suggests ________.
A. they have no solid cores B. heavier elements must be in gaseous form in their interiors C. they are very hot D. they are hollow E. they contain large quantities of light elements, such as hydrogen and helium
The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere does the temperature of the sun change the most rapidly with distance?
a. 1,000 km
b. 2,300 km
c. 2,500 km to 4,000 km
d. 400 km
e. a and c
An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.