A wind farm generator uses a two-bladed propeller (see figure) mounted on a pylon at a height of 20 m
The length of each propeller blade is 12 m. A small piece from the tip of the propeller breaks off when the propeller is vertical. At that instant, the period of the motion of the propeller is 1.2 s. The fragment flies off horizontally, falls with negligible air resistance, and strikes the ground at P.
(a) How far is point P from the base of the pylon?
(b) At what angle with respect to the vertical is the fragment moving just as it strikes the ground at P?
What will be an ideal response?
Answer: (a) 160 m (b) 68°
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The spectrum of a star shows the 656 nm absorption line shifted to 654 nm. Which of the following can we conclude about this star?
A. The star is spinning rapidly. B. The star is approaching us with an approximate speed of 1,800 km/sec. C. The star is receding with an approximate speed of 1,800 km/sec. D. The star is approaching us with an approximate speed of 900 km/sec. E. The star is receding with an approximate speed of 900 km/sec.
Io's volcanoes contribute material to a(n) ________ around the planet Jupiter's equator
Fill in the blank(s) with correct word
The source of all wave motion is
A) a wave pattern. B) a harmonic object. C) something vibrating. D) a region of variable high and low pressure. E) none of the above
Current: A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)
A. 1.5 × 1022 B. 5.1 × 1022 C. 1.8 × 103 D. 8.1 × 103 E. 1.0 × 1023