Lets say that you are holding a mass from a string and that you are in an elevator. If you plucked the string, in which case would the ensuing waves have the greatest speed?
1.if the elevator were accelerating upward
2.if the elevator were accelerating downward
3.if the elevator were moving upward with constant speed
4.if the elevator were moving downward with constant speed
1
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At what frequency will a 50.0-mH inductor have a reactance XL = 700 ??
A. 352 Hz B. 777 Hz C. 1.25 kHz D. 2.23 kHz E. 14 kHz
Consider an RLC circuit. The impedance of the circuit increases if XL increases
A) always true B) never true C) true only if XL is greater than or equal to XC D) true only if XL is less than or equal to XC
Hypernovae are
a. supernovae that occur when two red dwarfs collide. b. supernovae that occur when 10-solar-mass stars explode. c. supernovae that occur when stars more massive than 25 solar masses explode. d. one theory to explain the production of gamma-ray bursters. e. supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.
Water is flowing through a pipe with a constriction. The diameter of the narrow section is one-half the diameter of the wide section. If the velocity of the incompressible fluid is 3.20 m/s in the wide section, then what is the velocity of the fluid in the narrow section?
A. 16.5 m/s B. 18.7 m/s C. 19.8 m/s D. 10.5 m/s E. 12.8 m/s