Determine the expected diameter of water vapor bubbles in liquid water at 2000C if the surface tension is 40 mN/m and the pressure difference between the inside and the outside of the bubbles is 100 Pa.
What will be an ideal response?
This is a fluid statics problem and the free body diagram of the bubble yields Equation 10-1 in a form,
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An atomic nucleus has a charge of +40e. What is the magnitude of the electric field at a distance of from the center of the nucleus? (k = 1/4??0 = 8.99 × 109 N ? m2/C2,
e = 1.60 × 10-19 C) A) 5.4 × 10-8 N/C B) 5.6 × 10-8 N/C C) 5.8 × 10-8 N/C D) 6.0 × 10-8 N/C E) 6.2 × 10-8 N/C
What is the magnitude of the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.90 cm and 3.6 cm, respectively, and a separation between lenses of 20 cm?
a. 460 c. 20 b. 12 d. 150
An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 24 kW/m2 B) 12 kW/m2 C) 8.0 kW/m2 D) 4.0 kW/m2
Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers
You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections. A) 2.05 m B) 2.57 m C) 2.91 m D) 1.71 m