7. Two people are pushing on a \( 40 \mathrm{~kg} \). One is prahing with \( 290 \mathrm{~N} \) to the left and the other is pushing with a force of \( 180 \mathrm{~N} \) to the right. a) If the box is not moving what is the frictional force? b) What is the coefficient of friction? \[ \sqrt{392 N} \\ {F_{9}=40 \times 9.8} \\ {F_{9}=392 \pi} \end{array} \]
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Two blocks (A and B) remain stuck together as they are pulled to the right by a force $F=200 \mathrm{~N}$ ( $\mathbf{r}$ Fig. 4.47 ). $\mathrm{B}$ is on a rough horizontal tabletop (coefficient of kinetic friction of 0.800 ). (a) What is the acceleration of the system? (b) What is the force of friction between the two objects?
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Boxes $A$ and $B$ are in contact on a Horizontal, friction less surface, as shown in Fig. $E 4.23 .$ Box $A$ has mass 20.0 kg and box $B$ has mass 5.0 kg. A horizontal force of 100 N is exerted on box A. What is the magnitude of the force that box $A$ exerts on box $B ?$
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