Water flows in a flexible tube of radius 1.5 cm at the floor level of a house. If the tube is joined to a second tube of smaller radius (1.2 cm), what is the speed of water in this smaller radius tube at a height of 7.2 m above the floor?
A. 8.9 m/s
B. 4.5 m/s
C. 13.9 m/s
D. 11.1 m/s
D. 11.1 m/s
Physics & Space Science
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Which of the items below is electromagnetic radiation?
a. gamma rays
b. X-rays
c. visible light
d. radio
e. All of the other choices are correct.
Physics & Space Science
When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of
A) hydrogen. B) helium. C) lithium. D) carbon. E) none of the above
Physics & Space Science
The energy to extend a crack in a stressed material comes from _________of stresses along the crack surface.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 21.0 cm from the mirror, what is its focal length?
a. 14.0 cm b. 42.0 cm c. 10.5 cm d. 42.0 cm e. 21.0 cm
Physics & Space Science