Compound Microscope: The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separation is 6.0 cm when adjusted for minimum eyestrain for a person with a near point of 25.0 cm. If the microscope is focused on a small object, the magnitude of its final overall magnification is closest to
A. 50.
B. 100.
C. 150.
D. 200.
E. 250.
Answer: B
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Pluto is classified as a dwarf planet because
A. it has not cleared its neighborhood. B. it is not spherical. C. it doesn't orbit the Sun. D. All of these choices are correct.
Analyze these generalizations about the eight planets in our solar system. Determine if they most likely apply to planets closer or farther away from the sun.
Potential Energy: A +5.0-nC charge is at the point (0.00 m, 0.00 m) and a -2.0-nC charge is at (3.0 m, 0.00 m). What work is required to bring a 1.0-nC charge from very far away to point (0.00 m, 4.0 m)? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 15 nJ B. 3.6 nJ C. 11 nJ D. 7.7 nJ
An earthquake emits both S waves and P waves which travel at different speeds through the Earth. A P wave travels at 9 000 m/s and an S wave travels at 5000 m/s. If P waves are received at a seismic station 1.00 minute before an S wave arrives, how far away is the earthquake center?
A. 88.9 km B. 1200 km C. 675 km D. 240 km E. 480 km