Consider the baby being weighed in Figure 4.25. What is the mass of the child an

Question

Consider the baby being weighed in Figure 4.25. What is the mass of the child and basket if a scale reading of 100 N is observed? What is the tension T in the cord attaching the child to the scale? What is the tension T in the cord attaching the scale to the ceiling, if the scale has a mass of 0.400 kg? Draw a sketch of the situation indicating the system of interest used to solve each part. The masses of the cords are negligible. (Do this on paper. Your instructor may ask you to turn in this work.)

Explanation / Answer

a)

here

m = F / g

m = 100 / 9.8

m = 10.204 kg

B)

F = m * g

F = 10.204 * 9.8

F = 100 N

c)

T = ( m1 + m2 ) * g

= ( 10.204 + 0.4 ) * 9.8

= 104 N

d)

in the free body diagram of child only

the Tension is upside and downward is the m * g

then

in the free body diagram of child with scale

there is tension is upward and the downward is (m1 + m2 ) * g

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