A beam of polarized light of intensity I0 passes through a sheet of ideal polarizing material. The polarization axis of the beam and the transmission axis of the sheet differ by 45°. What is the intensity of the emerging light?
a. 0.25I0
c. 0.50I0
b. 0.87I0
d. 0.75I0
C
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When water freezes, the entropy of the water
A) increases. B) decreases. C) does not change. D) could either increase or decrease; it depends on other factors.
A slide projector is set up with its lens 6.0 m from the screen. The projected image on the screen is 1.5 m square for a slide (the object) that is 2.5 cm square
(a) How far is the slide from the lens? (b) What is the focal length of the projector lens?
The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 10^5 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?
a. 1.4 × 10^2 N b. 1.4 × 10^3 N c. 1.4 × 10^4 N d. 1.4 × 10^5 N e. 7.0 × 10^3 N
Suppose we put a 0.3-kg hunk of ice at 0°C into an insulating thermos bottle filled with 1000 g of water at 20°C. What will be the system’s final temperature?
A. Below 0°C B. Almost exactly 0°C C. Somewhat above 0°C, but below 10°C D. Very roughly 10°C E. Somewhat below 20°C, but above 10°C F. Almost exactly 20°C