Buoyancy: Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?
A. in salt water
B. in fresh water
C. The buoyant force is the same in both cases.
Answer: C
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Estimate the time required to freeze vegetables in thin, tin cylindrical containers 15 cm in diameter. Air at –12°C is blowing at 4 m/s over the cans, which are stacked to form one long cylinder. The physical properties of the vegetables before and after freezing may be taken as those of water and ice, respectively.
GIVEN
? The freezing of vegetables in thin tin cylindrical cans with air flowing over the cans
? Container diameter (D) = 15 cm = 0.15 m
? Air temperature (T?) = –12°C
? Air velocity (U?) = 4 m/s
? Vegetables have the same properties as water and ice
FIND
? The time (t) to freeze the vegetables
ASSUMPTIONS
? Air temperature is constant
? Thermal resistance of the tin can is negligible
? Thickness of the tin can is negligible
? Thermal capacitance of the frozen vegetable layer is negligible
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 are
Collisions between galaxies is thought to
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The index of refraction for a certain material is 1.399 for red light and 1.432 for blue light. Find the angle separating the two refracted colors if the: (a) angle of incidence is 30°. (b) angle of incidence is 60°
What will be an ideal response?
The ______________ for compounds are written by putting the composing elements' symbols adjacent to each other, with subscripts indicating the number of atoms of each
a. equations b. molecules c. isotopes d. formulas