Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)
a. accretion disk.
b. Lagrangian point.
c. Algol paradox.
d. planetary nebula.
e. supernova remnant.
a
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About 2% of our solar nebula consisted of elements besides hydrogen and helium. However, the very first generation of star systems in the universe probably consisted only of hydrogen and helium
Which of the following statements is most likely to have been true about these first-generation star systems? A) There were no comets or asteroids in these first-generation star systems. B) Jovian planets in these first-generation star systems had clouds made of water and other hydrogen compounds. C) These first-generation star systems typically had several terrestrial planets in addition to jovian planets. D) Like the jovian planets in our solar system, the jovian planets in these first-generation systems were orbited by rings.
A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.800 rad/s. A stationary listener is located at a distance from the carousel
The speed of sound is 350 m/s. The maximum beat frequency of the sirens at the position of the listener is closest to A) 6 Hz. B) 8 Hz. C) 10 Hz. D) 12 Hz. E) 14 Hz.
Two uses of ultrasound are __________ and __________
Fill in the blank(s) with correct word
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 x 10-6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is __________
Fill in the blank(s) with correct word