A(n) _________ is a collection of 10 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young
a. Herbig-Haro object
b. globular cluster
c. open cluster
d. giant cluster
e. supernova
c
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A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the earth, what is the speed of the rain with respect to the earth?
a. 48 km/h b. 95 km/h c. 58 km/h d. 32 km/h e. 80 km/h
The ______________ interaction alone can change one type of quark into another
Fill in the blank(s) with correct word
Wet cooling towers are the most efficient way to eliminate waste heat
What will be an ideal response?
In the calculation of the centripetal forces in a nickel-based gas-turbine blade, the density of the blade at the operating temperature of 1000°C is needed. However, only the room-temperature density is available. Using the thermal expansion coefficient for nickel, estimate the density of nickel at 1000°C. You can assume that the expansion of the nickel in the turbine blade is isotropic.
What will be an ideal response?