Question

Wer cranes are a common fixture at any major construction site.

They’re pretty hard to miss -- they often rise hundreds of feet into the

air, and can reach out just as far. The construction crew uses the

tower crane to lift steel, concrete, large tools like acetylene torches

and generators, and a wide variety of other building materials. A crane stands on a level

ground. It is represented by

a tower AB, of height 11 m

and a jib BR. The jib is of

length 20 m and can rotate

in a vertical plane about B.

A vertical cable,RS , carries

a load S . The diagram

shows current position of

the jib, cable and load.
hat is the length by which RS has been increased? (a) 8 √3 m (b) 8( √3 + 1) m (c) 8( √2 + 1) m (d) 8( √3 + 2) m​

Answer 1

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