In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at varying distances
Over what range must a lens of 45 mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 1.4 m from the camera? A) 1.49 mm
B) 1.20 mm
C) 4.48 mm
D) 5.98 mm
E) 2.09 mm
A
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We can study how galaxies evolve because
A) we can watch as they interact in real time. B) the farther away we look, the further back in time we see. C) galaxies are transparent to visible light. D) we are really smart astronomers.
Water flowing through a cylindrical pipe suddenly comes to a section of pipe where the diameter decreases to 86% of its previous value
If the speed of the water in the larger section of the pipe was what is its speed in this smaller section if the water behaves like an ideal incompressible fluid? A) 37 m/s B) 24 m/s C) 43 m/s D) 28 m/s
The straight-line distance and direction between two points are, together, called
a. velocity. b. displacement. c. distance. d. acceleration.
An object moving along the x axis is acted upon by a force Fx that varies with position as shown. How much work is done by this force as the object moves from x = 2 m to x = 8 m?
?
?
a.
?10 J
b.
+10 J
c.
+30 J
d.
?30 J
e.
+40 J