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28 Feb 2019
For safety reasons, an extension ladder should have a slope of between 6.3 and 9.5 when it is placed against a wall. If a ladder reaches 8 meters up a wall, what are the maximum and minimum distances from the foot of the ladder to the wall?
For safety reasons, an extension ladder should have a slope of between 6.3 and 9.5 when it is placed against a wall. If a ladder reaches 8 meters up a wall, what are the maximum and minimum distances from the foot of the ladder to the wall?
Joram GuingguingLv10
22 Feb 2021
that are not equally spaced. We can still estimate distances using the time periods
. For example, on May 7, 1992, the space shuttle Endeavour was launched on mission STS-49, the purpose of which was to install a new perigee kick motor in an Intelsat communication satellite. The table, provided by NASA, gives the velocity data for the shuttle between liftoff and the jettisoning of the solid rocket boosters. Use these data to estimate the height above the earth’s surface of the Endeavour, 62 seconds after liftoff.
at the point P.
m, use graphs of 
to show that the intensity is minimized when 
m, that is, when P is at the midpoint of ,.
m, show that the intensity (perhaps surprisingly) is not minimized at the midpoint.