A convex lens has focal length f. If an object is located at "infinity" (very far away), the image formed is located at a distance from the lens
A) of 2f.
B) between f and 2f.
C) of f.
D) between the lens and f.
E) of infinity.
C
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A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 ?N b. 16 ?N c. 18 ?N d. 12 ?N e. 0 ?N
A non-conducting sphere of radius R = 7 cm carries a charge Q = 4 mC distributed uniformly throughout its volume
At what distance, measured from the center of the sphere does the electric field reach a value equal to half its maximum value? A) 3.5 cm only B) 4.9 cm only C) 3.5 cm and 9.9 cm D) 3.5 cm and 4.9 cm E) 9.9 cm only
If two bicyclists move around a circular track of radius 100 m, at the same speed, 10 m/s, but in opposite directions, then
A. they have equal size accelerations, 1 m/s2. B. they might have different accelerations, depending on whether they have identical mass or not. C. they have opposite accelerations, +1 m/s2 (inward) and -1 m/s2 (outward). D. one has centripetal acceleration of 1 m/s2 and the other has centrifugal acceleration of 1 m/s2.
The element ______________ is a soft, active metal and forms a compound called lye
Fill in the blank(s) with correct word