The vertical flight of a helicopter is controlled by ____________.
A. collective pitch changes
B. torque and directional control
C. angle of attack.
D. relative position of the blades during rotation
The lift experienced by a helicopter involves increasing or decreasing of the collective pitch which is an action-reaction pair of forces between the helicopter blades and the air.
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The greatest astronomer of antiquity [that is, of the time before the Middle Ages] was
A) Ptolemy. B) Copernicus. C) Brahe. D) Aristotle. E) Plato.
A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19 C)
A) 11 × 10-27 kg B) 6.7 × 10-27 kg C) 4.5 × 10-27 kg D) 3.3 × 10-27 kg E) 8.2 × 10-27 kg
The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole
Fill in the blank(s) with correct word
If sunlight were green instead of white, the most comfortable color to wear on a cold day would be
A) magenta. B) yellow. C) green. D) blue. E) violet.