A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. What is the amplitude of the magnetic field of this light at a distance of 0.700 m from the bulb?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A) 1.76 × 10-7 T
B) 2.02 × 10-7 T
C) 2.22 × 10-7 T
D) 2.86 × 10-7 T
D
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Calorimetry: A 600-g piece of iron at 100°C is dropped into a calorimeter of negligible heat capacity containing 100 g of ice at 0°C and 120 g of water, also at 0°C. What is the final temperature of the system? The specific heat of iron is 448 J/kg ? K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K.
What will be an ideal response?
Compared to the mass of an apple on Earth, the mass of the apple on the Moon is
A) one sixth as much. B) the same. C) six times as much. D) zero.
The temperature of a 50 g sample of aluminum is raised from 20oC to 60oC when 440 cal of heat are added. The specific heat capacity of the aluminum is
A. 0.22 cal/g C°. B. 0.91 cal/g C°. C. not calculable from this data. D. 0.11 cal/g Co. E. 15.4 cal/g C°.
Which of the following best characterizes electrical insulators?
a. charges on the surface don't move b. high tensile strength c. electric charges move freely d. good heat conductors