Water is being sprayed from a nozzle at the end of a garden hose of diameter 2.0 cm. If the nozzle has an opening of diameter 0.50 cm, and if the water leaves the nozzle at a speed of 15 m/s, what is the speed of the water inside the hose?
a. 0.63 m/s
c. 2.5 m/s
b. 0.94 m/s
d. also 10 m/s
B
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A binary star system is one with two stars orbiting each other. How can the Doppler effect be used to find binary stars whose orbital plane is along our line of sight? Their periods?
What will be an ideal response?
Nuclear fission is the process by which
A) a number of smaller nuclei combine to form a larger nucleus with the release of energy B) electrons are rearranged inside an atom, releasing energy C) an electron is ejected from the nucleus of an atom, releasing energy D) large nuclei break up into smaller nuclei with the release of energy
Superconducting electromagnets
A) account for cases of magnetic levitation. B) are characterized by easy penetration of external magnetic fields. C) both of these D) none of the above
Complete destructive interference occurs for two waves of the same amplitude and frequency when the waves are ______________ degrees out of phase
Fill in the blank(s) with correct word