Compared to Keck, Hubble Space Telescope has:
A) better light gathering power but worse resolution
B) worse resolution and light gathering power
C) better magnification
D) better resolution and light gathering power
E) better resolution but worse light gathering power
Ans: E) better resolution but worse light gathering power
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In a composite material the _____________phase is continuous and is responsible for holding the composite material together.
Fill in the blank(s) with the appropriate word(s).
A 0.120 pF parallel-plate capacitor is charged to a potential difference of 10.0 V and then disconnected from the battery. A cosmic ray burst creates 1.00 × 10^6 electrons and 1.00 × 10^6 positive charges between the plates. If the charges do not recombine, but reach the oppositely charged plates, by how much is the potential difference between the capacitor plates reduced?
a. 1.33 V b. 7.34 V c. 8.67 V d. 1,330 V e. 8,670 V
The focal lengths of the objective and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain (with the final image at the viewer's far point) is 6.0 cm
The near point of the person using the microscope is 25 cm and the far point is infinity. (a) If the microscope is focused on a small object, what is the distance between the object and the objective lens? (b) If the microscope is focused on a small object, what is its final magnification?
An object of mass m is hanging by a string from the roof of an elevator. The elevator is slowing down. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator