An airplane is flying at a speed of 200 m/s in level flight at an altitude of 800 m. A package is to be dropped from the airplane to land on a target on the ground. In what direction will the package be traveling when it hits the ground?
A) 49.3° below horizontal
B) 62.7° below horizontal
C) 54.8° below horizontal
D) 84.2° below horizontal
E) 32.1° below horizontal
E
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Matter Waves: An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 409 nm B. 302 nm C. 205 nm D. 420 nm E. 502 nm
Electromagnetic radiation of wavelength 200. nanometers is which type?
A) X-rays B) ultraviolet C) microwaves D) AM radio E) visible
The ____________________ shows that sunspots are associated with magnetic activity
Fill in the blank(s) with correct word
About what percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 0 percent B) 0.1 percent C) 2 percent D) 20 percent E) 80 percent