1.At the foot of the mountain the elevation of its summit is 45 degree after asending 1000 m towards the mountain up a slope of 30 degree inclination , the eleation is found out to be 60 degree.find the height of the mountain.
2.A round balloon of radius 'a' subtends an angle alpha at the eye of the observer while the angle of elevation of its center is beta. Prove the height of the center of the balloon is a “sin beta cosec alpha /2”.
Asked by tanishqa.rathod | 20th Oct, 2015, 08:38: PM
Answered by Vimala Ramamurthy | 21st Oct, 2015, 12:55: PM
- On a warm and lazy Saturday, Rishi is watching a county maintenance crew mow the park across the street. He notices the mower takes 16 sec to pass through 60c of rotation from one end of the park to the other. If the corner of the park is 40 meter directly across the street from his house, (i) How wide is the park? (ii) How fast (in kmph) does the mower travel as it cuts the grass?
- The angle of elevation of the top of a tower from two points distant s and t from its foot are complementary. Prove that the height of the tower is √st.
- a person standing on the bank of a river observes that the angle subtented by a tree on the opposite bank of 60 degree. when he retreates 20m from the bank he find the angle to be 30 degree . find the height of the tree and the bradth of the river
- If two crows are sitting at a height of 15 m and 10 m on different trees vertically opposite to each other. They view a vaddi (an estable) on the ground at a angle of depression 45°and 60° respectively. They start at the same time and fly at the same speed along the shortest path to pick up the vadai.Which bird will succeed in it.?
- the angle of elevation of a cloud from a point h metre above a lake is theta. the angle of depression of its reflection in the lake is 45 degree. Find the height of the cloud
- a fire in the building Bis reported on telephone to two fire staitons P and Q, 20 km apart from each other on a straight road P observes that the fire is at an angle of 60 degree to the road and Q observes that it is at an angle of 45 degree to the road. What station should send its team and how much time will this team have to travel?
- from a point on the ground the angles of elevation of the bottom and top of a communication tower fixed on the top of a 20 meter high building a 45 degree and 60 degree respectivelyf.find the height of the tower.
- From the top of a building 60 d high, the angles of depression of the top and the bottom of a tower are observed to be 30°and 60° respectively. Find the height of the tower.
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