What is the distance between the two polar coordinates (2.0, 30°) and (9.0, 145°)?
a. 6.0
b. 10.0
c. 9.8
d. 9.2
b
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Intensity of Sound: The intensity level is 65 dB at a distance 5.00 m from a barking dog. What would be a reasonable estimate for the intensity level if two identical dogs very close to each other were barking? You can ignore any interference effects.
A. 65 dB B. 68 dB C. 130 dB D. 136 dB
Which of the following polymers cannot be joined by fusion welding?
(a) PE (b) PVC (c) Epoxy (d) PTFE
A square smooth conduit, 80 cm on a side, circulates 35°C air in a large building. The pressure drop over a 50-m length of the horizontal conduit is not to exceed 800 Pa. Assume an average pressure in the conduit of 120 kPa. The maximum flow rate in the conduit is nearest:
Force on a Wire: A wire along the z-axis carries a current of 4.9 A in the +z direction. Find the magnitude and direction of the force exerted on a 3.3-cm long length of this wire by a uniform magnetic field pointing in the -x direction having a magnitude 0.43 T.
What will be an ideal response?