The unit of power, watt, is dimensionally the same as:
a. joule-second.
b. joule/second.
c. joule-meter.
d. joule/meter.
b
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Fluid Flow: Water flowing through a cylindrical pipe suddenly comes to a section of pipe where the diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was 32 m/s, what is its speed in this smaller section if the water behaves like an ideal incompressible fluid?
A. 43 m/s B. 37 m/s C. 28 m/s D. 24 m/s
Mass on a Spring: A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)
A. Its acceleration is zero. B. Its speed is zero. C. Its elastic potential energy is zero. D. Its kinetic energy is a maximum. E. Its total mechanical energy is zero.
Which of the following statements regarding the motion of objects on the celestial sphere is true?
A. The Moon moves along the Celestial Equator. B. The stars move along the zodiac. C. The stars move parallel to the Celestial Equator. D. The Sun moves along the Celestial Equator.
Microwave radiation is useful in which of the following?
a. sending phone messages b. cooking food c. aircraft navigation d. All of the above are valid choices.