The eyepiece of a compound microscope has a focal length of 2.50 cm, and the objective has a focal length of 1.60 cm. The two lenses are separated by 14.0 cm. The microscope is used by a person with normal eyes, having a near point at 25 cm
What is the magnitude of the magnification of the microscope? A) 72
B) 88
C) 180
D) 219
E) 115
A
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A 40.0-L container is divided into two equal parts by a rubber membrane. One half of the container has 1.50 moles of an ideal monatomic gas at 250 K, and the other half is a vacuum
The container is well insulated, so there is no exchange of heat with the surroundings. The membrane breaks, and eventually the gas reaches a new equilibrium condition occupying the entire volume. What is the final temperature of the gas? A) 125 K B) 250 K C) 157 K D) 180 K E) 100 K
A cook plugs a 500 W crockpot and a 1 000 W kettle into a 240 V power supply, all operating on direct current. When we compare the two, we find that
a. Icrockpot < Ikettle and Rcrockpot < Rkettle. b. Icrockpot < Ikettle and Rcrockpot > Rkettle. c. Icrockpot = Ikettle and Rcrockpot = Rkettle. d. Icrockpot > Ikettle and Rcrockpot < Rkettle. e. Icrockpot > Ikettle and Rcrockpot > Rkettle.
A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is
A) 180° from the original direction. B) 135° from the original direction. C) 45° from the original direction. D) between 90° and 180° from the original direction. E) 90° from the original direction.
An air-filled 3.0 nF capacitor is charged to 8.0 V. If the plate separation is 100
m what is the energy density in the electric field?
a. 
b. 
c. 
d. 
e. 