If you move twice as far away from a lawn mower running in an open field, the amplitude of the sound you hear will be ___________ what it was before
a. the same as
b. twice
c. half
d. four times
e. one fourth
C
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Light is a transverse wave
a. True b. False Indicate whether the statement is true or false
A cylindrical tank is assembled by welding steel sections in a heli-cal pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The circumferential strain in the wall of the tank is approximately:
(A) 1.9 3 1024
(B) 3.2 3 1024
(C) 3.9 3 1024
(D) 4.5 3 1024
A gas expands at constant temperature from an initial volume of 0.040 m3 and an initial pressure of 210 kPa until its pressure drops to 135 kPa. How much work is done by the system?
A) 3.0 kJ B) 3.7 kJ C) 4.1 kJ D) 5.6 kJ E) 7.9 kJ
A two-shell-eight-pass heat exchanger is used to recoup heat from coolant water in a manufacturing plant. The heat exchanger has a rated area of 15 m^2 with an overall heat transfer coefficient of 900 W/m^2?K. The device has been used and has a fouling factor of 0.0001 m2?K/W. The coolant water enters at 85ºC and leaves at 55ºC whereas the cooling water enters at 15ºC and leaves at 45ºC. Determine (a) the mass flow of the coolant water and (b) the heat exchanger effectiveness.
What will be an ideal response?