If the tension on a guitar string is increased by a factor of 2, the fundamental frequency at which it vibrates is changed by what factor?
a. 0.5
c. 2–1/2
b. 21/2
d. 2
B
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The inside surface of a 1-m-long vertical 5-cm-ID tube is maintained at 120°C. For saturated steam at 350 kPa condensing inside, estimate the average heat transfer coefficient and the condensation rate, assuming the steam velocity is small.
GIVEN
? Steam condensing inside a vertical tube
? Tube length (L) = 1 m
? Tube inside diameter (D) = 5 cm = 0.05 m
? Tube surface temperature (Ts) = 120°C
? Steam pressure (p) = 350 kPa
FIND
? The average heat transfer coefficient (hc)
ASSUMPTIONS
? Steady state
? The steam velocity is small
? Film condensation occurs
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated water at 350 kPa
A baseball catcher puts on an exhibition by catching a 0.175-kg ball dropped from a helicopter at a height of 89.0 m. What is the speed of the ball just before it hits the catcher's glove 1.00 m above the ground? (g = 9.80 m/s2 and ignore air resistance)
a. 41.5 m/s b. 0.482 m/s c. 1 730 m/s d. 29.4 m/s e. 42.0 m/s
A stretched string is observed to vibrate in three equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string?
a. 480 Hz b. 320 Hz c. 160 Hz d. 640 Hz e. 240 Hz
Two traveling waves have the forms z1 = A sin(kx - ?t), z2 = A sin(kx + ?t ) Express their superposition in the form of a standing wave
A) 2A cos(kx) cos( ?t ) B) 2A sin(kx) cos( ?t ) C) 2A sin(kx) sin( ?t ) D) A sin[(kx )2 - (?t )2] E) 2A cos(kx) sin( ?t )