A ladder 11m long leans against a vertical wall at an angle of 75\(^o\) to the ground. The ladder is the pushed 0.2 m up the wall. (a) Illustrate the inform...

Answer Details

(a) Here is a diagram to illustrate the situation:

        |
        |
        |\
        | \
        |  \  11m
        |   \
        |    \
        |     \
        |      \
        |       \
        |        \
        |         \
        |          \
        |           \
        |____________\
              wall

The ladder is represented by the diagonal line, the wall by the vertical line, and the ground by the horizontal line. The angle between the ladder and the ground is labeled as 75 degrees.

(b)

1. When the ladder is pushed up the wall, the distance between the foot of the ladder and the wall decreases. This means that the angle between the ladder and the ground will also decrease. To find the new angle, we need to use trigonometry.

   Let x be the distance that the foot of the ladder moves up the wall. Then, the length of the ladder that is still on the ground is 11 - x. Using trigonometry, we can set up the following equation:

   cos(new angle) = adjacent / hypotenuse
   cos(new angle) = (11 - x) / 11
       

   We know that the original angle was 75 degrees, so we can substitute that in and solve for the new angle:

   cos(new angle) = (11 - x) / 11
   cos(75) = (11 - 0.2) / 11
   0.258819 = 10.8 / (11 - x)
   2.827 = 11 - x
   x = 8.173
       

   Therefore, the new angle which the ladder makes with the ground is approximately 50 degrees (to the nearest whole number).

2. To find the distance the foot of the ladder has moved from its original position, we can simply subtract the new distance from the old distance:

   distance moved = 0.2 m - 8.173 m
   distance moved = -7.973 m
       

   However, this answer doesn't make sense because the foot of the ladder can't move a negative distance. Instead, we need to realize that the negative sign means that the foot of the ladder moved to the left of its original position, rather than to the right. Therefore, the distance the foot of the ladder moved is approximately 8 meters to the left (to the nearest whole number).