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Physics
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2 Dec 2020

What type of energy transfer occurs when the heat in the sand transfers to the person's feet?

Booster class
Mechanics 1
Skill
Applying the law of energy conservation
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

one kg of Refrigerant 22, initially at p1 = 0.9 MPa, u1 =232.91 kJ/kg, is contained within a rigid closed tank. The tank is fitted with a paddle wheel that transfers energy to the refrigerant at a constant rate of 0.1 kW. Heat transfer from the surroundings to the refrigerant occurs at a rate of Kt, where K is a constant with units of kW/minute, and t is the time in minutes. After 20minutes of stirring, the refrigerant is at p2 = 1.2 MPa, u2 =276.67 kJ/kg. There is no change in the kinetic or potential energy. For the refrigerant, determine the work and heat transfer in kJ. Determine the value of the constant K appearing in the given heat transfer equation, in kW/min.

What is the change in internal energy of a system which does 4.50 × 105 J of work while 3.00 × 106 J of heat transfer occurs into the system, and 8.00 × 106 J of heat transfer occurs to the environment?

 

Suppose a woman does of work and of heat transfer occurs into the environment in the process.

(a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.)

 

(b)

The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency?

Efficiency: Eff:  

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