Question
A flagpole stands on top of a building. From a point 50
meters away from the base of the building, the angle of elevation to the top of the building is 30°, and to the top of the flagpole is 45°. Find the height of the flagpole.Solution
Let the height of the building be h meters, and the height of the flagpole be f meters. From the angle of elevation to the top of the building (30°): tan 30° = h / 50 1/√3 = h / 50 h = 50 / √3. From the angle of elevation to the top of the flagpole (45°): tan 45° = (h + f) / 50  1 = (h + f) / 50  h + f = 50. Substitute h = 50 / √3: (50 / √3) + f = 50. f = 50 - (50 / √3). f = 50(1 - 1/√3). f = 50(√3 - 1) / √3. Answer: d
The silk fibres are held together in cocoon by a substance known as……………………
Saline soils could be improved by:-
Largest soil order in world is
During a prolonged dry spell, a farmer notices soil crusting in the field. What could be a possible consequence of soil crusting on the crops?
What is soil sickness?
What is the primary function of humus in soil?
Which of the following groups of nutrients is absorbed by plants only in anionic form?
………………………….. is designed to break up hard layers or pans without bringing them to the surface.
...When the contact of soil moisture still decreased below the wilting point in way that the water is held very tightly & may be state of vapour around soi...
According to USDA classification of salt affected soils; a soil having EC >4 mmho/cm; ESP >15; pH
