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Energy Transfer Methods in Systems

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Questions and Answers

What is the conservation of energy equation for an isolated system?

Emech = K + U
Power = Joule / second
Esystem = 0 (correct)
Emech = 0

What is the physiological unit of food energy in the body?

Joule
Met (correct)
Calorie
Watt

What represents the instantaneous power in a system?

(K + U)
(dW/dt) (correct)
(KU)
(K - U)

What percentage of food energy in the body is typically used by the brain under resting conditions?

19% (A) Signup and view all the answers

What is the unit of heat production in the body?

Kcal/minute (B) Signup and view all the answers

How many Joules are equivalent to 1 Kilocalorie?

4184 (A) Signup and view all the answers

Which mechanism of energy transfer is driven by a temperature difference between two regions in space?

Heat (D) Signup and view all the answers

What is the primary mathematical representation of the energy version of the analysis model of a non-isolated system?

$\Delta E_{system} = \Sigma T$ (B), $\Delta E_{system} = \Sigma T$ (D) Signup and view all the answers

Which type of energy transfer allows a disturbance to propagate through a medium?

Mechanical Wave (B) Signup and view all the answers

What is the result of energy conservation in a system?

Energy can only change by crossing the system boundary (D) Signup and view all the answers

Which symbol is used for the energy transferred across the system boundary by electric current?

$W$ (B) Signup and view all the answers

What does it mean when we say that 'energy is conserved'?

Energy cannot be created nor destroyed (D) Signup and view all the answers

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