Physics
If there are n movable pulleys with one fixed pulley, the mechanical advantage is given by :
- 2n
- 2n+1
- 2n-1
- 2n+2
Machines
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Answer
2n
Reason — In general, if there are n movable pulleys with one fixed pulley, the mechanical advantage is then 2n.
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Related Questions
The mechanical advantage of an ideal single movable pulley is:
- 1
- 2
- less than 2
- less than 1.
Which of the following statements is incorrect?
- The velocity ratio of a single fixed pulley is always 1.
- The velocity ratio of a single movable pulley is always 2.
- The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2n.
- The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting load.
Which of the following differences between a single fixed pulley and a single movable pulley is incorrect?
Single fixed pulley Single movable pulley (1) It is fixed to a rigid support (i) It is not fixed to a rigid support. (2) The load moves in a direction opposite to the effort. (ii) The load moves in the direction of effort. (3) Its ideal mechanical advantage is 1. (iii) Its ideal mechanical advantage is 1. (4) Its ideal velocity ratio is 2. (iv) Its ideal velocity ratio is 1. (5) The axis of rotation does not move in space. (v) The axis of rotation also moves. - (5)
- (2) and (5)
- (3) and (5)
- (3) and (4)
The relationship between mechanical advantage (M.A.) and velocity ratio (V.R.) for a practical machine is:
- M.A.= V.R.
- M.A.> V.R.
- M.A.< V.R.
- None of these