As more lamps are connected in a parallel circuit, the overall current in the power source
A) increases.
B) decreases.
C) stays the same.
Answer: A
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A(n) _________is a material added to a polymer to lower the glass transition temperature.
Fill in the blank(s) with the appropriate word(s).
Thin Lenses: A thin lens projects an image of a man as shown in the figure. Rays marked A, B, and C travel to the lens from the man's ear. Draw the paths of these three rays after they have passed through the lens. Note that A is parallel to the principal axis, B goes through the center of the lens, C goes through the focal point on the left, and the point marked f is the focal point on the right of the lens.
What will be an ideal response?
A bucket of water with total mass 21.0 kg is attached to a rope, which in turn is wound around a 0.050-m radius cylinder, with crank, at the top of a well. The moment of inertia of the cylinder and crank is 0.21 kg m2 . The bucket is raised to the top of the well and released to fall back into the well. What is the kinetic energy of the cylinder and crank at the instant the bucket is moving with
a speed of 5.4 m/s? a. 4.8E+2 J b. 1.2E+3 J c. 3.1E+2 J d. 1.2E+4 J
A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?