A stretched string can have ______________ natural frequency(ies)
a. one
b. 10 times its length in
c. 5 times its length in
d. many
d
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PCM thermal storage systems can be used to store thermal energy from solar energy collectors. The solar collector heats water and the hot water is then passed through the PCM for storage. Then, energy is extracted by passing cold water through the tubes to heat that water. For a system using a PCM having a phase change at 95ºF, with cold water at 65ºF passing through the tubes, and with Bi = 30, NTU = 8, and Fr0 = 0.6, determine the outlet water temperature. Assume tubes have a square arrangement with spacing of 2D.
What will be an ideal response?
A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
What is the direction of the velocity of the wave?
A. the x direction B. the y direction C. the z direction D. the t direction
Which two methods can be combined to determine an extrasolar planet's density?
A) Doppler and astrometric observations B) Doppler and transit observations C) Doppler and gravitational lensing observations D) astrometric and gravitational lensing observations
For the following balanced reaction, which of the following is a gas?
2 Na(l) + Cl2(g) ? 2 NaCl(s) A) Na B) 2 Na C) Cl2 D) Cl E) NaCl