An observer will measure the wavelength of waves emanating from a source that is moving away as longer than it really is
Indicate whether the statement is true or false
TRUE
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An engineer uses a river 
to cool his electrical plant which heats water with a boiler operating at 
What’s the maximal performance (in terms of efficiency) theoretically possible for this electrical plant?
A. 64% B. 36% C. 27% D. 73%
Air circulation around a cyclone in the Northern Hemisphere as viewed from above is
a. counterclockwise. b. the same as in the Southern Hemisphere. c. toward the center of the low-pressure area. d. along isobars.
Which of the following is not a characteristic of continental glaciation?
A) striations B) U-shaped valleys C) drumlins D) moraines
Gravitational Force: Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r. What is the magnitude of the new gravitational force?
A. F/16 B. F/4 C. 16F D. 4F E. F/2