A microscope has an objective lens with an aperture diameter 0.60 cm. A monochromatic light source of wavelength 580 nm is used to illuminate the object. It is determined that the minimum angle of resolution is 1.18 × 10^-4 rad. If the present lens were replaced by one with an aperture of diameter 1.0 cm, what would the minimum angle of resolution now become? (1 nm = 10-9 m)
a. 1.5 × 10^-4 rad
c. 0.71 × 10^-4 rad
b. 0.79 × 10^-4 rad
d. 1.8 × 10^-4 rad
C
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Starting from one oasis, a camel walks 25 km in a direction 30° south of west and then walks 30 km toward the north to a second oasis. What is the direction from the first oasis to the second oasis?
A. 21° N of W B. 39° W of N C. 69° N of W D. 51° W of N E. 42° W of N
A 39-kg girl standing at rest on slippery (frictionless) ice catches a 1-g ball moving at 10 m/s. Just afterward, the girl is
A) moving at 0.5 m/s. B) at rest. C) moving at 2 m/s. D) moving at 4 m/s. E) moving at 0.25 m/s.
What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the south celestial pole?
?
a.
20° N
b.
20° S
c.
70° N
d.
70° S
e.
0°
As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the
A) air resistance acting against the ball. B) acceleration of the ball. C) ball's pull on Earth. D) none of the above