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78.
REASONING
Newton’s second law, Equation 4.2a, can be used to find the
tension in the coupling between the cars, since the mass and acceleration are known. The
tension in the coupling between the 30
th
and 31
st
cars is responsible for providing the
acceleration for the 20 cars from the 31
st
to the 50
th
car. The tension in the coupling
between the 49
th
and 50
th
cars is responsible only for pulling one car, the 50
th
.
SOLUTION
a.
The tension
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This note was uploaded on 01/29/2010 for the course CALC 01:640:135 taught by Professor Soffer during the Spring '08 term at Rutgers.
 Spring '08
 SOFFER

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