Specific Heat: An aluminum electric tea kettle with a mass of 500 g is heated with a 500-W heating coil. How long will it take to heat up 1.0 kg of water from 18°C to 98°C in the tea kettle? The specific heat of aluminum is 900 J/kg ? K and that of water is 4186 J/kg ? K.
A. 5.0 minutes
B. 7.0 minutes
C. 12 minutes
D. 15 minutes
E. 18 minutes
Answer: C
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An ideal solenoid having a coil density of 5000 turns per meter is 10 cm long and carries a current of 4.0 A. What is the strength of the magnetic field at its center?
A) 13 mT B) 3.1 mT C) 6.2 mT D) 25 mT
Light of colors 1 and 2 are sent through a prism and the rays of light of color 2 bend more. Which of the following is not true?
a. The speed of light for color 2 is greater than that for color 1 in this prism. b. The index of refraction for color 2 is greater than that for color 1. c. The wavelength for color 1 is different than that for color 2 in this prism. d. The two colors of light have different frequencies associated with them.
Spectral lines are often referred to as the stars' "fingerprints" because:
A) fingerprints also consist of individual lines that make a pattern. B) both are unique to their source. C) both can be easily categorized. D) both are characteristic of the individual that produced them. E) All of these are correct.
What happens when a particle of matter meets its corresponding antiparticle of antimatter?
A) They can form a complete atom. B) The combined mass of the two particles is completely transformed into energy (photons). C) They fuse to make a heavier particle. D) The question makes no sense, since antimatter does not really exist.