Which type of star has the strongest stellar winds?
A) giant K- and M-type stars
B) white dwarfs
C) dwarf K- and M-type stars
D) main sequence O- and B-type stars
E) T Tauri stars
D
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Earth's magnetic field is not stable; throughout geologic time it has changed direction. This change is attributed to
A) changes in the direction of fluid flow in the molten outer core of Earth. B) magnetic pole reversals. C) fluctuations in the time / space continuum. D) changes in the direction of fluid flow in the molten inner core of Earth.
It's 6 a.m. and the Moon is at its highest point in your sky (crossing the meridian). What is the Moon's phase?
A) new B) first quarter C) full D) third quarter
A blacksmith is flattening a steel plate that measures 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
what is the total rate at which it radiates energy? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4. Ignore any heat it receives from the surroundings. A) 360 W B) 760 W C) 790 W D) 850 W E) 880 W
The kinetic energy of a pendulum is least
a. when its potential energy is least. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.