The walls of an ice chest are made of 2.00 cm thick styrofoam with a thermal conductivity 0.0300 W/m?K
The total surface area of the ice chest is 1.20 m2. If 4.00 kg of ice at 0.00°C are placed in the chest and the temperature outside the chest is 20.0°C, how long does it take the ice to melt? Remember that the latent heat of fusion of water is 79.6 cal/g.
A)
4.22 hours
B)
22.1 hours
C)
17.6 hours
D)
1.33 days
E)
10.3 hours
E
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Which of the following best describes rain on Venus?
A) It does not have rain. B) It has sulfuric acid rain that causes erosion on the surface. C) It has sulfuric acid rain in its atmosphere, but the drops evaporate before hitting the surface. D) It has liquid water rain that causes erosion on the surface.
Which planet had the Great Dark Spot in 1989, but had lost it by 1995?
A) Jupiter B) Saturn C) Mars D) Neptune E) Uranus
According to the laws of thermal radiation, hotter objects emit photons with
A) a shorter average wavelength. B) a lower average frequency. C) a lower average energy. D) a higher average speed.
Water is sent from a firehose at 30.0 m/s at an angle of 30.0° above the horizontal. What is the maximum height reached by the water?
A. 7.50 m B. 11.5 m C. 15.0 m D. 19.0 m E. 30.0 m