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A 15000-kg helicopter is lowering a 4800-kg truck by a cable of fixed length. The truck, helicopter, and cable are descending at 16.0 m/s and must be slowed to 5.00 m/s in the next 53.0 m of descent to prevent damaging the truck. Assume a constant rate of slowing.
(a) Determine the tension in the cable.
kN
(b) Determine the lift force of the helicopter blades.
If light is measured traveling through some medium at 0.90c, where c represents the speed of light in a vacuum, what is the index of refraction of the medium
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