Thin Lenses: A convex lens has focal length f. If an object is placed at a distance of 2f from the lens on the principal axis, the image 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.
Answer: A
You might also like to view...
The diagram below illustrates a portion of the model for the universe described by
Equilibrium: When a car is weighed, it is driven slowly on a horizontal floor over a scale that records a reading as the front wheels go over the scale, and then records a second reading as the rear wheels go over the scale. The weight of the car is equal to
A. the weight under the front wheels. B. the weight under the rear wheels. C. the average of the two weights. D. the sum of the two weights. E. the difference of the two weights.
Relative Velocity: A plane moving 200 m/s horizontally fires a projectile with speed 50 m/s in a forward direction 30.0° below the horizontal. At that instant, what is the speed of the projectile with respect to a stationary observer on the ground?
A. 245 m/s B. 250 m/s C. 268 m/s D. 293 m/s
A beam is pin-connected to the tops of two identical pipe columns, each of height h, in a frame. The frame is restrained against sidesway at the top of column 1. Only buckling of columns 1 and 2 in the plane of the frame is of interest here. The ratio (a/L) defining the placement of load Qcr, which causes both columns to buckle simultaneously, is approximately:
(A) 0.25
(B) 0.33
(C) 0.67
(D) 0.75
