The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If electrical energy costs 5.5 cents per kW-hr, what does it cost to raise the 200 kg of water in the tank from 15°C to 80°C? (The specific heat of water is 4 186 J/kg°C)
83 cents
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It takes ________ years for the sun to progress through one sunspot cycle, wherein sunspots appear at high latitudes, shift to lower and lower latitude, then return to high latitudes. Refer to the graph above
A) about 10 years B) about 110 years C) about 1 year D) This figure cannot be used to answer this question.
Conductor A has 11 electrons and conductor B has 32 electrons. The number of valence or conduction electrons in A and B is given as
A) A:2 and B:4. B) A:4 and B:2. C) A:4 and B:4. D) A:1 and B:4. E) A:4 and B:1.
What is the drag coefficient CD?
What will be an ideal response?
Solids emitted by volcanoes can range in size from fine dust to boulders. Such solids are known collectively as ______________
Fill in the blank(s) with correct word