The loudness of a sound wave is determined by its ______________
Fill in the blank(s) with correct word
amplitude
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Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
A. 80 N B. 40 N C. 69 N D. 57 N E. 75 N
Compound Microscope: A compound microscope consists of an objective lens of focal length f0 and an eyepiece that by itself produces an angular magnification 25.0. The microscope is designed so that the object to be viewed is on the left side of the objective lens and is focused in a plane that is 28.00 cm away from the right-hand (or inside) focal point of the objective lens. When properly adjusted, the eyepiece and the objective lens are 29.90 cm apart. The eyepiece magnification is based on an image at infinity and a near point at 25.0 cm. What is f0?
Fill in the blank(s) with the appropriate word(s).
Suppose you live on the Moon. When people on Earth see a first-quarter phase, what phase do you see for Earth?
A) new Earth B) first-quarter Earth C) crescent Earth D) third-quarter Earth E) full Earth
What are the advantages and disadvantages of Earth having the tilt that it does?