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
C
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If the stars at the turnoff point of a cluster have a mass of 3 M?, what is the age of the cluster?
a. 3.0 x 1010 years b. 3.3 x 109 years c. 6.4 x 108 years d. 1.6 x 1011 years e. The age of a star cluster can not be determined from the mass of stars at the turnoff point.
When we say that an electromagnetic field is "quantized," we mean that
A) whenever it interacts with atoms, it must deposit an entire "quantum" of energy at each interaction. B) its energy is "digitized" to have either 0, 1, 2, 3, etc. units of a basic energy increment. C) it impacts a viewing screen as tiny bundles of radiation. D) All of the above. E) None of the above.
A 200-m radio telescope is used to investigate sources emitting a 21-cm wavelength. The minimum angular separation resolvable for this system is
A) 0.073°. B) 0.03°. C) 0.0013°. D) 0.154°. E) 0.0026°.
Which of the following materials has the highest dielectric constant?
A. air B. Mylar C. paper D. Pyrex glass E. water