[单选题]
Three identical masses are connected a
,irfzv * d0;m p*gdc:bdwn,- qs shown with a string
k vac2b g em15j/k3t;k that passes over an ideal pulley. The tension in the string
kk 12j5atg /;bcm kve3 connecting $m_1$ and $m_2$ is $T_1$
. The tension of the string attached to $m_3$ is $T_2$
The acceleration of the $m_3$ is $\frac{g}{4}$
Which of the following is correct for $T_2$ and the acceleration of $m_1$
A. $\frac{5T_1}{3}$ -$\frac{g}{4}$
B. $\frac{3T_1}{5}$ $\frac{g}{4}$
C. $\frac{5T_1}{3}$ $\frac{g}{4}$
D. $\frac{3T_1}{5}$ -$\frac{g}{4}$
参考答案:
A
本题详细解析:
All of the masses are connected therefore
2n0tnvoj 1pae47u 5 8z(jkkui the magnitude of the acceleration is the same
jv(2 8oa54t7 uik ukn0p 1enjzfor all of them. But $m_1$ is accelerating in the opposite direction to the direction of $m_3$
Therefore, the acceleration of the $m_1$ is $\frac{g}{4}$
When Newton's second law is applied to $m_1$
.