1 ) A system takes in 570 J of heat while performing 930 J of work. What is the

Question

1 ) A system takes in 570 J of heat while performing 930 J of work. What is the change in internal energy of the system? unit in j

2 ) The internal energy of a system increases by 300 J while 900 J of work are performed on it. What was the heat flow into or out of the system? unit in j

3 ) A model steam engine of 1.00-kg mass pulls eight cars of 1.00-kg mass each. The cars start at rest and reach a velocity of 3.00 m/s in a time of 5.00 s while moving a distance of 4.80 m. During that time the engine takes in 135 J of heat. What is the change in the internal energy of the engine? unit in j

Explanation / Answer

1 .

U =q + w

= 570 - 930 = -360 J <------ans

2 .

U = w + q ;

300 = 900 + q ;

q = -600 J <------ans

3 .

W = F . x ;

v = u + at ;

3 = a * 5 ;

a = 0.6 m /s^2 ;

F = ma = ( 1 + 8 ) * 0.6 = 5.4 N ;

W = 5.4 * 4.8 = 25.92 J .

U = -25.92 + 135 = 109.08 J <----------ans

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