A pair of parallel plates, forming a capacitor, are charged. The plates are pulled apart to triple the original separation, the charges on the plates remaining the same. What is the ratio of the final energy stored to the original energy stored?
a. 1/9
c. 1/3
b. 1.5
d. 3
D
Physics & Space Science
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Thermodynamic Devices: A heat pump with a performance coefficient (COP) of 4.9 absorbs heat from the atmosphere at a rate of 29 kW. At what rate is work being done to run this heat pump?
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Work done within an isolated system can increase the energy of the system
a. True b. False Indicate whether the statement is true or false
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How many electrons are in chromium's (atomic number 24) next to outer shell (n = 3)?
a. 1 b. 14 c. 12 d. 13 e. 8
Physics & Space Science