When energy is released in a chemical reaction, the reaction is called a(n) ______________ reaction
Fill in the blank(s) with correct word
exothermic
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An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?
A) average speed B) instantaneous speed C) average acceleration D) instantaneous acceleration E) displacement
Which of the following ranges corresponds to the shortest wavelengths?
a. infrasonic c. ultrasonic b. audible d. All have the same wavelengths.
Based on discoveries to date, which of the following conclusions is justified?
A) Planetary systems are common and planets similar in size to Earth are also common. B) Although planetary systems are common, few resemble ours with terrestrial planets near the Sun and jovian planets far from the Sun. C) Planets are common, but planets as small as Earth are extremely rare. D) Most stars have one or more terrestrial planets orbiting within their habitable zones.
A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool). If some of the cargo is thrown overboard, the level of water in the lock will
A) rise. B) drop. C) stay the same. D) rise, provided it is lumber that is thrown overboard. E) rise, provided it is iron ore that is thrown overboard.