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class 10
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Answer:
CASE STUDY
A crane stands on a level ground. It is represented by a tower AB, of height 24m and a jib BR. The jib is of length 16m and can rotate in a vertical plane about B. A vertical cable, RS carries a load S. The diagram shows the current position of the jib, cable and load.
(a) 8√3m (b) 4√3m (c) 4√2m (d) 8√2m (2) What is the angle that the jib, BR, makes with the horizontal? ketan
(1) What is the distance BS?
(c) 60°
(b) 30°
(d) 45°
(a) 45°
(3) What is the measure of the angle BRS?
(a) 60°
(b) 75⁰
(c) 30°
(4) Now the jib BR has been rotated and the length RS is increased. The load is now on the ground at a point 8m from A. What is the angle through which the jib has been rotated?
(a) 15°
(b) 25°
(c) 30°
(d) 45°
(5) What is the length by which RS has been increased? (a) 8√3m (b) 8(√3+ 1)m (c) 8(√2+1) m (d) 8(√3+2)m
Step-by-step explanation:
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