Problem 2: An elevator starts at rest on the ground floor. The elevator moves so that its acceleration is shown
as a function of time below.
(a) Is the elevator moving upward, moving downward, or at rest at time = 12 seconds? If the elevator is
moving, state its speed. In any case, explain your reasoning.
(b) Is the elevator moving upward, moving downward, or at rest at time t 22 seconds? If
the elevator is
moving, state its speed. In any case, explain your reasoning.
Answers: 1
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Heterogeneous mixture with larger particles that never settle is
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Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.
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Problem 2: An elevator starts at rest on the ground floor. The elevator moves so that its accelerati...
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