Rocks solidified from molten material, either below or above ground, are classified as ______________ rocks
Fill in the blank(s) with correct word
igneous
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An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wing. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?
A. the lift force on the airplane is zero B. the drag force on the airplane is zero C. the lift force on the airplane is 42,000 N upward D. the drag force on the airplane is 38,000 N downward E. the drag force on the airplane is 2,000 N backward
What does this diagram represent?
A) the basic way in which the greenhouse effect works B) the carbon dioxide cycle C) the basic reason that our sky is blue D) the basic mechanism of the Coriolis effect
The speed of light in diamond is 1.24 × 10^8m/s. What is the index of refraction of diamond?
For a forced vibration, the amplitude of vibration is found to depend on the
A) sum of the external frequency and the natural frequency. B) difference of the external frequency and the natural frequency. C) product of the external frequency and the natural frequency. D) ratio of the external frequency and the natural frequency. E) ratio of the natural frequency and the external frequency.