If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km
b. 350,000 km
c. 194 km
d. 700,000 km
e. 4656 km
d
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A steel stack of 4 m diameter is 60 m high and is used to exhaust gases that are at an average temperature of 600ºC. The stack wall temperature is 1000 when the surrounding air temperature is 20ºC. Estimate the stack gas velocity.
What will be an ideal response?
A charged insulator can be discharged by passing it just above a flame. This is because the flame:
A) warms it B) dries it C) contains carbon dioxide D) contains ions E) contains more rapidly moving atoms
From film taken in SkyLab and the Space Shuttle, we learned that objects in SkyLab
A. have mass but no weight. B. have mass but no force due to gravity. C. have neither mass nor weight. D. fall to the floor with an acceleration of 9.5 m/s2.
Why do quasars die out over time?
What will be an ideal response?