Compound Microscope: A compound microscope has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm. It is adjusted for minimum eyestrain for persons with a near point of 25 cm. If the two lenses are separated by 40.0 cm, what is the total overall magnification?
A. 28
B. 56
C. 470
D. 550
E. 2200
Answer: C
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An electron with a speed of 2.0 × 10^6 m/s moves into a uniform electric field of 325 N/C that is parallel to the electron's motion. How long does it take to bring the electron to rest? (me = 9.11 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 3.5 × 10^-8 s c. 2.3 × 10^-8 s b. 2.3 × 10^-6 s d. 1.2 × 10^-7 s
What evidence do we have that Earth has a molten core?
What will be an ideal response?
A Carnot engine operating between a reservoir of liquid mercury at its melting point (233 K) and a colder reservoir extracts of heat from the mercury and does of work during each cycle. What is the temperature of the colder reservoir?
A) 47 K B) 186 K C) 163 K D) 207 K
The most prominent theory about spiral arms is called the _____
A) spiral quantum fluctuations B) spiral gravitational collapse C) spiral density wave theory D) spiral radiation theory