The temperature of boiling water is
A) 100°C.
B) 212°F.
C) both of these
Answer: C
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Conduction: A glass tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3 C° per minute. What is the temperature of the outside surface of the bottom of the tea kettle? Neglect the heat capacity of the kettle, and assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of glass is 0.840 W/m ? K and the specific heat of water is 4186 J/kg ? K.
A. 39°C B. 92°C C. 120°C D. 86°C E. 77°C
A sinusoidal electromagnetic wave is propagating in vacuum. At a given point P and at a particular time, the electric field is in the +x direction and the magnetic field is in the -y direction. (a) What is the direction of propagation of the wave?
(b) If the intensity of the wave at point P is what is the electric field amplitude at that point? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) What will be an ideal response?
How do we know that galaxy clusters contain a lot of mass in the form of hot gas that fills spaces between individual galaxies?
A) The hot gas shows up as bright pink in visible-light photos of galaxy clusters. B) We infer its existence by observing its gravitational effects on the galaxy motions. C) We detect this gas with X-ray telescopes. D) We can observe the frictional effects of the hot gas in slowing the speeds of galaxies in the clusters.
A rock that is readily attacked by chemical weathering is
A) limestone. B) granite. C) basalt. D) gneiss.