Point A is between points B and C. The distances of B and C from A are 2000m and 3000m, respectively. Measured from point A, the angle of elevation of point B is +18°30', while that on point C is +8°15'. Find the difference in elevations between B and C.
Point A is between points B and C. The distances of B and C from A are 2000m and 3000m, respectively. Measured from point A, the angle of elevation of point B is +18°30', while that on point C is +8°15'. Find the difference in elevations between B and C.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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4G
22
KB/s
Point A is between points B and C.
The distances of B and C from A are
2000m and 3000m, respectively.
Measured from point A, the angle of
elevation of point B is +18°30', while
that on point C is +8°15'. Find the
difference in elevations between B
and C.
Your answer
A backsight of 3.265m is taken on a
point 175 m from a level station and a
foresight of 1.118m from the same
station. Determine the difference in
elevation between the two points,
taking into account the combined
effect of curvature and refraction.
Your answer
Two identical towers, A and B, are
located on level ground and their
bases have equal elevations above
sea level. Determine the distance (in
feet) between the two towers if a
person standing on top of tower A
can just see the top of tower B. His
eyes on the level of top of tower A is
50 ft above the ground.
Your answer
By taking a sight across a lake 15
miles wide through a pair of
binoculars, determine the height (in
feet) of the shortest tree on the
opposite shore whose tip the
observer can see. Assume that the
eyes of the observer are 5 feet and 6
inches above the shore line which he
stands.
Your answer
3
II"
Transcribed Image Text:46 2:35 0.30 sE
4G
22
KB/s
Point A is between points B and C.
The distances of B and C from A are
2000m and 3000m, respectively.
Measured from point A, the angle of
elevation of point B is +18°30', while
that on point C is +8°15'. Find the
difference in elevations between B
and C.
Your answer
A backsight of 3.265m is taken on a
point 175 m from a level station and a
foresight of 1.118m from the same
station. Determine the difference in
elevation between the two points,
taking into account the combined
effect of curvature and refraction.
Your answer
Two identical towers, A and B, are
located on level ground and their
bases have equal elevations above
sea level. Determine the distance (in
feet) between the two towers if a
person standing on top of tower A
can just see the top of tower B. His
eyes on the level of top of tower A is
50 ft above the ground.
Your answer
By taking a sight across a lake 15
miles wide through a pair of
binoculars, determine the height (in
feet) of the shortest tree on the
opposite shore whose tip the
observer can see. Assume that the
eyes of the observer are 5 feet and 6
inches above the shore line which he
stands.
Your answer
3
II
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