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You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:

A) The trailer is slightly raised
B) The trailer is level with the fifth wheel
C) The trailer is touching the ground
D) The trailer is lowered and secured

Answer :

Final answer:

A trailer bouncing up and down slowly is likely nearly empty since a heavy load would dampen such movements, indicating the role of the suspension system's dynamics.

Explanation:

When you notice a trailer bouncing up and down slowly on the highway, it is more likely that the trailer is nearly empty. A heavily loaded trailer would have less bounce because the extra weight would dampen the suspension's movement.

Conversely, a nearly empty trailer lacks the mass needed to absorb the energy from road bumps and irregularities, leading to a more pronounced and slower bouncing motion. This is due to the dynamics of the trailer's suspension system which is designed to absorb shocks; without sufficient load, the springs extend and compress with greater amplitude and less resistance.

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