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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% Signup and view all the answers

What is the unit of heat production in the body?

Kcal/minute Signup and view all the answers

How many Joules are equivalent to 1 Kilocalorie?

4184 Signup and view all the answers

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

Heat 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?

$\Delta E_{system} = \Sigma T$ Signup and view all the answers

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

Mechanical Wave 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 Signup and view all the answers

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

$W$ Signup and view all the answers

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

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