what is pulley¿
what is lever.
what is wedge
Answers
Explanation:
Let Nishu take x days to complete the work alone.
∴ Total work done by Nishu in 1 day = 1x
Also, Pintu takes (x + 6) days to complete the work alone.
∴ Total work done by Pintu in 1 day = 1x+6
Total work done by both in 1 day = (1x + 1x+6)
But, both take 4 days to complete the work together.
∴ Total work done by both in 1 day = 14
∴ 4(2x + 6) = x(x + 6)
∴ 8x + 24 = x2 + 6x
∴ x2 + 6x – 8x – 24 = 0
∴ x2 – 2x – 24 = 0
∴ x2 – 6x + 4x – 24 = 0
∴ x(x – 6)+ 4(x – 6) = 0
∴ (x – 6) (x + 4) = 0
Answer:
Pulley
It is a simple wooden or metallic machine that uses a wheel and rope to lift heavy loads.
Lever
A lever is a simple machine consisting of a rigid rod which is capable of turning around a pivot called a fulcrum. It has three parts, namely, effort, load and fulcrum.
Wedge
A wedge is a simple machine that is used to break apart the substances by applying force. A nail is a common example of a wedge. In a nail, the force is applied to the wide head area.