A 2.0-kg object is lifted vertically through 3.00 m by a 150-N force. How much work is done on the object by gravity during this process?
What will be an ideal response?
-59 J
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As you are moving very quickly toward a speaker emitting a pure tone, which characteristics of the sound get larger? (There may be more than one correct choice.)
A) frequency B) amplitude C) wavelength D) period E) loudness
You are removing a pie from a 350°F oven, and while you need to protect your hands from the pie pan, the backs of your hands and your wrists and forearms are unprotected, yet they don't get burned. Why?
What will be an ideal response?
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye (image at the far point) having a near point of 25 cm and a far point at infinity?
A) 5.0 x B) 3.0 x C) 4.0 x D) 1.0 x E) 2.0 x
In order to move in a perfectly circular path, the net force on an object must
A. equal zero. B. have a constant magnitude and direction. C. always change both magnitude and direction. D. always change magnitude but not direction. E. always change direction but not magnitude.