Which of the following would make the demonstration illustrated in this figure function less effectively?
a. Use a piece of cardboard with a greater mass.
b. Use a piece of cardboard with a greater radius.
c. Use a piece of cardboard with less mass and smaller radius.
d. Use a thinner pencil.
e. Use a thicker pencil.
c
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Which of the following patterns in the Milky Way structure is consistent with the idea that the Milky Way has not suffered a major collision with another massive galaxy?
A) The halo is full of old stars orbiting in many different directions. B) Globular clusters are compact groups of thousands of stars. C) The disk is composed of stars of many different ages. D) The disk is composed of stars orbiting in the same plane, same direction.
A certain slide projector has a lens of focal length 15.0 cm. This lens forms an image measuring 100 cm × 100 cm on the screen when a slide whose dimensions are 50.0 mm × 50.0 mm is being magnified
How far from the lens should the screen be placed?
Determine the potential difference, VA ? VB, in the circuit segment shown below when I = 2.0 mA and Q = 50 ?C
a.
?40 V
b.
+40 V
c.
+20 V
d.
?20 V
e.
?10 V
A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 170 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 51°. How high is the fountain?
a. 17 m c. 30 m b. 23 m d. 33 m