Most stars on the H-R diagram are on the ____________________
Fill in the blank(s) with correct word
main sequence
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The supernova generated by the explosion of a high mass star fades slowly because of energy generated by ____
a. magnetic fields around the neutron star b. disintegration of iron in the core of the star c. radioactive decay of nickel formed in the expanding shell of the supernova d. fusion of the remaining hydrogen in the star e. matter-antimatter disintegration around the collapsed core
Fluid Flow: A pressurized cylindrical tank, 5.0 m in diameter, contains water that emerges from the pipe at point C with a speed of 13 m/s as shown in the figure. Point A is 10 m above point B and point C is 3.0 m above point B. The area of the pipe at point B is 0.080 m2 and the pipe narrows to an area of 0.040 m2 at point C. Assume that the water is an ideal fluid in laminar flow. The density of water is 1000 kg/m3 The mass flow rate in the pipe is closest to
A. 520 Kg/s. B. 470 Kg/s. C. 420 Kg/s. D. 360 Kg/s. E. 310 Kg/s.
Thin Lenses: An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm. Where is the image of this object located?
A. 60 cm to the right of the lens B. 60 cm to the left of the lens C. 8.6 cm to the right of the lens D. 8.6 cm to the left of the lens E. 30 cm to the left of the lens
An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates. All the geometric parameters of the capacitor (plate diameter and plate separation) are now DOUBLED
If the original energy density between the plates was u0, what is the new energy density? A) 16u0 B) 4u0 C) u0 D) u0/4 E) u0/16