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Which of the following is a composite nu...

Which of the following is a composite number?
a) 2
b) 3
c) 9
d) 7

Text Solution

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The correct Answer is:
A, B, D
According to the question
`04g-T_1=00.4a`……..1
`T_2-0.2g=0.2a`……2
`(T_1-T_2)r=(la)/r`……..3
From eq. 1, 2, and 3
`rarr a=((0.4-0.2)g)/((0.4+0.2+1.6/0.4))=g/5` ltb. Therefoee b. `V=sqrt(2gh)=sqrt(2xgxx1/20`
`rarr sqrt((g/5))=sqrt((9.8/5))=1.4m/s`
a. total kinetic energy of the system
`=1/2m_1V^2+1/2m_2V^2+1/2 15^`
` =(1/2xx0.4xx1.4^2)+(1/2xx0.2xx1.4^2)+ {1/2xx(1.6/4xx1.4^2)}`
`=(0.2+0.1+0.2)(1.4)^2`
`=0.54x1.96=0.98Joule`
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