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
Physics & Space Science
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The center of mass of an object has to be located within the object
Indicate whether the statement is true or false
Physics & Space Science
The energy attributed to an object by virtue of its motion is known as
A) potential energy. B) kinetic energy. C) radiative energy. D) mass-energy.
Physics & Space Science
Early AM radios required very long antennae wires. FM antennae are often approximately a meter in size. Can you surmise why sensitive FM aerials are much smaller than those AM wires?
What will be an ideal response?
Physics & Space Science
The angular resolution of an 8 inch diameter telescope is ________ times greater than that of a 2 inch diameter telescope
A) 8 B) 2 C) 16 D) 4 E) 9
Physics & Space Science