A vertical side of a cooling tower is approximately 90ºC when the surrounding air is 25ºC. If the tower is 30 m high, estimate the maximum vertical velocity of the air due to natural convection.
What will be an ideal response?
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The ecliptic is
a. the centerline of the zodiac. b. the projection of Earth's orbit on the sky. c. the apparent path of the sun around the sky. d. all of the above e. none of the above
Potential of Point-Charges: Point charges +4.00 ?C and +2.00 ?C are placed at the opposite corners of a rectangle as shown in the figure. What is the potential at point B due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. 8.99 kV B. 11.2 kV C. 89.9 kV D. 899 kV E. 112 kV
The force required to maintain a body at constant velocity in free space is equal to
1) the mass of the body. 2) zero. 3) the weight of the body. 4) the force required to stop it. 5) none of these. This is in accordance with the law of 6) inertia. 7) action/reaction. 8) gravitation. 9) energy conservation.
Two lasers emit equal numbers of photons per second. If the first laser emits red light and the second emits blue light, the power radiated by the first is
A. equal to that emitted by the second. B. greater than that emitted by the second. C. less than that emitted by the second. D. dependent on the time interval of the emission.