The tractor exerts a towing force $\backslash ($ T$=400\backslash$mathrm$\{$lb$\}\backslash ).$ It has a weight of $7900$ lb and a center of gravity located at $\backslash ($ G$\_\{$T$\}\backslash ).$ An additional weight of $600$ lb is added to its front having a center of gravity at $\backslash ($ G$\_\{$A$\}\backslash ).$ Take $\backslash (\backslash$mu$\_\{$s$\}=0\mathrm{.}4\backslash ).$ The front wheels are free to roll. $($Figure $1)$

Figure

Determine the tractive frictional force $\backslash ($ F $\backslash )$ on each rear tire needed to pull the load forward at constant velocity.

Express your answer to three significant figures and include the appropriate units.

$\backslash [$

F$=$

$\backslash ]$

Determine the normal reactions at each of the two front tires.

Express your answer to three significant figures and include the appropriate units.

$\backslash [$

N$\_\{$B$\}=\backslash$quad$[$

$\backslash ]$

Part B

Determine the normal reactions at each of the two rear tires.

Express your answer to three significant figures and include the appropriate units.

$\backslash [$

N$\_\{$C$\}=$

$\backslash ]$

Part C $\backslash (\backslash$cdot $\backslash )$