The blue light from the sky has been polarized by:
a. selective absorption.
b. reflection.
c. double refraction.
d. scattering.
d
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A 400-g piece of metal at 120°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?
A) 1470 J/(kg?K) B) 2830 J/(kg?K) C) 3420 J/(kg?K) D) 3780 J/(kg?K) E) 4280 J/(kg?K)
A 40.0 cm long organ pipe is filled with air and is open at both ends. The velocity of sound in air at0
is 331 m/s. If the temperature of the air increases by 10
then what is the frequency of the fundamental mode?
A. 367 Hz B. 395 Hz C. 401 Hz D. 421 Hz E. 480 Hz
A runner is running a kilometer in 8.30 seconds in still, dry air at a temperature of 25.0
Her skin has a temperature of 35.0
and an exposed area is 1.00 m2. If the convective coefficient is 22.0 W/m2 
then what is the rate of heat flow from her skin to the air?
A. 95.7 W B. 102 W C. 186 W D. 220 W E. 285 W
In an RC circuit, how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?
A. 2.2 B. 1.9 C. 1.6 D. 3.0 E. 5.0