Posted by CR on Sunday, February 20, 2011 at 11:27pm.
A Boeing 747 "Jumbo Jet" has a length of 59.7m. The runway on which the plane lands intersects another runway. The width of the intersection is 25.0m. The plane decelerates through the intersection at a rate of 5.7 m/s(squared) and clears it with a final speed of 45.0 m/s. How much time is needed for the plane to clear the intersection?

Physics  Henry, Tuesday, February 22, 2011 at 12:30pm
d(tot) = 25 + 59.7 = 84.7m.
Vf^2 = Vo^2 + 2*(5.7)84.7 = (45)^2,
Vo^2  965.58 = 2025,
Vo^2 = 2025 + 965.58 = 2990.58,
Vo = 54.7m/s.
Vf = Vo + at,
Vf = 54.7  5.7t = 45,
54.7  5.7t = 45,
5.7t = 4554.7 = 9.7,
t = 9.7 / 5.7 = 1.70s.

Physics  swag, Sunday, October 2, 2011 at 7:23pm
1.7 seconds
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