Sprint 9:43 AM 47% Post-Lab 3 - Newton\'s Three Laws of Motion www.webassign.net

Question

Sprint 9:43 AM 47% Post-Lab 3 - Newton's Three Laws of Motion www.webassign.net The questions below refer to an elevator with a mass of 1700 kg, which has a cable attached to the top of the elevator car. In these questions, the elevator is moving from a lower floor to a higher floor. (a) At the beginning of its ascent, the elevator is moving upward and speeding up at a rate of 0.12 m/s/s. What upward force is the cable exerting on the elevator during this time? Fcable = 1.20. x N (b) Which image below (A F) most correctly shows the forces acting on the elevator while it is speeding up at the beginning of its ascent? (c) During most of its ascent, the elevator is moving upward at a constant speed. What upward force is the cable exerting on the elevator during this time? (d) Which image below (A F) most correctly shows the forces acting on the elevator while it is moving upward at a constant speed? A B CDEF

Explanation / Answer

(a) Total force = F = mg + ma = 1700(.12+9.8) = 16864 N

(b) c

(c) F = mg = 16660 N

(d) (b)

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