Egyptian dams have brought unmitigated blessings to Egypt
What will be an ideal response?
Egypt has certainly benefited greatly from the construction of dams. As with
every dam (see the list of 19 social and environmental problems in Extension 22.1), there
are some environmental problems with the dams in Egypt. Salinization is a big problem in
the Egyptian dams, especially for the Aswan High Dam. It is a thus a stretch to say that
everything coming from the dams was a blessing.
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At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
a. 3.8 m/s b. 3.4 m/s c. 5.0 m/s d. 4.4 m/s e. 4.6 m/s
If the speed of a car is doubled but the brakes apply the same force, the distance required to stop the car changes by a factor of
A. ½. B. 2. C. ¼. D. 4. E. 1.
The critical number for the rate of universal expansion and age of the Big Bang is ________
Fill in the blank(s) with correct word
Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen (A) increases, (B) decreases, or (C) remains the same if, (a) The wavelength of the light increases.
A. increases B. decreases C. remains the same