Having a lot of problems with chapter 9, and hardly any of theproblems are worke

Question

Having a lot of problems with chapter 9, and hardly any of theproblems are worked out it seems.
Conceptual Example 7 provides useful background for thisproblem. Workers have loaded a delivery truck in such a way thatits center of gravity is only slightly forward of the rear axle, asshown in the figure. The mass of the truck and its contentsis 7460 kg. Find the magnitudes of the forces exerted by theground on (a) the front wheels and(b) the rear wheels of the truck. The center of gravity is .63-meters to the right of the backaxle, and 2.3- meters to the left of the front axle.
Having a lot of problems with chapter 9, and hardly any of theproblems are worked out it seems.
Conceptual Example 7 provides useful background for thisproblem. Workers have loaded a delivery truck in such a way thatits center of gravity is only slightly forward of the rear axle, asshown in the figure. The mass of the truck and its contentsis 7460 kg. Find the magnitudes of the forces exerted by theground on (a) the front wheels and(b) the rear wheels of the truck. The center of gravity is .63-meters to the right of the backaxle, and 2.3- meters to the left of the front axle.

Explanation / Answer

Torque = Fr Mass: Torque = (7460*9.8)(0.63) = 46058.84Nm Front wheel/axle: Torque = F (0.63 + 2.30) = 2.93F 2.93F =46058.84 Nm F = 15719.4675N or 1.57x104N(This is the upward force of the front wheel. This added to theforce of the rear wheel should equal the weight of the truck andits contents. Therefore:) 15719.4675 + F =7460*9.8 F = 57388.5325N (The force exerted by the ground on the rear wheel)

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