Thin Lenses: How far from a converging lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
Fill in the blank(s) with the appropriate word(s).
20 cm
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If Q = 350 ?C and I = 4.0 mA in the circuit segment shown below, determine the potential difference, VA ? VB
a.
?30 V
b.
+80 V
c.
+40 V
d.
?40 V
e.
+10 V
Estimate the thermal conductivity of platinum at -10ºC if its electrical conductivity is 6 x 10^7 mhos/m, based on the Wiedemann-Franz law. Note: 1 mho = 1 amp/volt = 1 coulomb/volt-s, 1 W = 1 J/s = 1 volt-coulomb/s.
What will be an ideal response?
The image of x-ray emission uses different colors to represent different levels of brightness. The dark blue color represents the least bright x-ray emission. Which color represents the brightest x-ray emission?
What will be an ideal response?
The electric field just outside the surface of a hollow conducting sphere of radius 20 cm has a magnitude of 500 N/C and is directed outward. An unknown charge Q is introduced into the center of the sphere and it is noted that the electric field is still directed outward but has decreased to 100 N/C. What is the magnitude of the charge Q?
a. 1.5 nC b. 1.8 nC c. 1.3 nC d. 1.1 nC e. 2.7 nC