Which of the following materials would you expect to be isotropic?
(a) A casting of aluminum
(b) Aluminum foil
(c) Aluminum wire
(d) A polyethylene sheet 0.01 cm (0.004 inch) thick
(a) A casting of aluminum
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An electron is traveling due south when it enters a uniform magnetic field directed due west. Which of the following statements concerning this situation is false?
a) The subsequent motion of the electron will be the same as if there were an electric field directed due west and no magnetic field present. b) The electron will follow a curved path. c) The direction of the magnetic force on the electron will vary with time. d) The magnitude of the magnetic force will be constant with time. e) The direction of the magnetic field and the direction of the magnetic force on the electron are perpendicular to one another.
A planet is detected via the Doppler technique. The velocity change of the star is a measure of
A) the planet's size and density. B) the planet's mass and orbital distance. C) the planet's mass and composition. D) the planet's orbital period and eccentricity. E) the planet's size and orbital distance.
Which of the following best describes why the smaller terrestrial worlds have cooler interiors than the larger ones?
A) They were cooler when they formed. B) The smaller ones are farther from the Sun. C) They have relatively fewer radioactive elements. D) They have relatively more surface area compared to their volumes. E) They had more volcanic eruptions in the past, which released their internal heat.
Why does exponential growth seem so surprising in its outcome to most people?
What will be an ideal response?