« previous blem 9.78 Part A he mobile in ass of 0.838 kg. Neglect the weights of

Question

« previous blem 9.78 Part A he mobile in ass of 0.838 kg. Neglect the weights of the crossbars is in equilibrium t B ha Determine the mass of object A Express your answer to three significant figures and include the appropriate mA0286 Units Submit M·Answers GiveUp Incorrect; Try Again; 5 attempts remaining Enter your answer using dimensions of mass. Part B Determine the mass of object C Express your answer to three significant figures and include the appropriate uni gure 1 of1 -? me Value Units 30.00 cm 7.50 cm 15.00 cm 5.00 cm Submit My Answers Give Up 17.50 cm 5.00 cm Part C Determine the mass of object D Express your answer to three significant figures and include the appropriate units

Explanation / Answer

or equilibrium of the crossbar to which C and D are attached,
mD *17.5 = mC *5
mC = 3.50mD ----------(1)
For equilibrium of the crossbar to which B is attached,
(mC + mD) *15 = mB *5

mC + mD =0.838*(5/15)

mC+mD=0.2793 -----------------(2)

from 1

3.5mD+mD=0.2793

mD=0.062 kg

mC=3.5*0.062=0.217 kg

For the equilibrium of the crossbar to which A is attached,
mA*30 = (mB + mC + mD) * 7.5
mA * 30 = (0.838 + 0.062 + 0.217)*7.5
mA = 0.2793 kg
a)

mA=0.2793 kg

b)

mC=0.217 kg

c)

mD=0.062 kg

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