Gamma-ray telescopes, such as the Fermi Gamma Ray Space Telescope, are launched into space because they are dangerous to operate on Earth.
Answer the following statement true (T) or false (F)
False
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Two waves are described by ? y1 = 6 cos(180t?) and y2 = 6 cos(186t) (both in meters). ? What effective frequency does the resultant vibration have at a point?
A. 92 Hz B. 183 Hz C. 6 Hz D. 3 Hz E. 366 Hz
Which of the following general statements about light and Earth's atmosphere is not true?
A) Visible light from the Sun is absorbed in the exosphere. B) X-rays from the Sun are absorbed in the thermosphere. C) Ultraviolet from the Sun is absorbed primarily in the stratosphere. D) Infrared light emitted by Earth itself is absorbed primarily in the troposphere.
A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N. The work done on the hammer as it falls is
a. 4.45 N-m. b. 44.5 N-m. c. 445 N-m. d. 4,450 N-m.
Proper motion of a star is measured in meters
Indicate whether the statement is true or false