Compound Microscope: The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm, respectively. An object is placed 3.00 mm from the objective. The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. What is the distance between the objective and the eyepiece?
A. 9.9 cm
B. 9.0 cm
C. 15 cm
D. 11 cm
E. 13 cm
Answer: D
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A polyethylene bar (E 5 1.4 GPa, ? 5 0.4) of diameter 80 mm is inserted in a steel tube of inside diameter 80.2 mm and then compressed by axial force P. The gap between steel tube and polyethylene bar will close when compressive load P is approximately:
(A) 18 kN
(B) 25 kN
(C) 44 kN
(D) 60 kN
A satellite encircles Mars at a distance above its surface equal to 3 times the radius of Mars. If gm is the free-fall acceleration at the surface of Mars, what is the free-fall acceleration at the location of the satellite?
A) gm/9 B) 0 C) gm D) gm/3 E) gm/16
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s?
a. 3.0 rev/s b. 1.5 rev/s c. 0.48 rev/s d. 0.24 rev/s
How are tensional and compressional forces related to faulting and folding?
What will be an ideal response?