A(n) ______________ is a substance composed of two or more elements chemically combined in a definite, fixed proportion by mass
Fill in the blank(s) with correct word
compound
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An ion engine provides a small but constant force on a spacecraft as it moves from Earth to Pluto. Compare the acceleration of the spacecraft near the beginning of its journey with its acceleration as it flies past Pluto.
A. The spacecraft's acceleration at Pluto is slower than its acceleration near Earth. B. The spacecraft's acceleration at Pluto is the same as its acceleration near Earth. C. The spacecraft's acceleration at Pluto is faster than its acceleration near Earth. D. The relative acceleration cannot be determined with the information given.
A 30 N-force toward the west is applied to an object. The object moves 50 m east during the time the force is applied. What is the change in kinetic energy of the object?
A) 0.0 J B) 1.7 J C) 1.0 J D) -1500 J E) 750 J
What is spectroscopy?
A) An analysis of the way in which atoms absorb and emit light B) A study of the geometry of rainbows C) An observational technique to measure the brightness of light at different colors D) The use of CCDs to capture light more efficiently than with photographic film E) A method to freeze atmospheric turbulence for better resolution
At what frequency will a 12-?F capacitor have a reactance XC = 300??
a. 44 Hz b. 88 Hz c. 180 Hz d. 350 Hz e. 280 Hz