The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. To accomplish this, the mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by the block and tackle system?

  1. 👍 0
  2. 👎 0
  3. 👁 436
  1. Force applied x distance = 225 x 37.5 = 8438 J
    is the work done. Only 4500*1.5 = 6750 J is used raising the engine. The rest was used overcoming friction.

    The block and tackle is not 100% efficient. The efficiency is 80%

    1. 👍 1
    2. 👎 0
  2. 6750

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    Two blocks are pushed along a horizontal frictionless surface by a force of 20 newtons to the right. The force acts on the 3 kg block, which in turn pushes the 2kg block sitting next to it. The force that the 2-kilogram block

  2. physics

    A block of metal which weighs 60 newtons in air and 40 newtons under water has a density, in kilograms per meter cubed, of:

  3. Physical Science

    Two objects were lifted by a machine. One object had a mas of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilogram was lifted at a rate of 3 m/sec. ------------------------------------------- a)

  4. Integrated Physics and Science

    A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever? A) 100% because energy must be conserved B) 90% C) 25% D) 18% i

  1. physics

    A 1-kg block is lifted vertically 1m by a boy. The work done by the boy would be one jule or would no work be done. I'm confused, I thought lifting wasn't considered work. The work done is actually about 9.81 joules. Think of

  2. physics

    A box weighing 100 newtons is pushed up an inclined plane that is 5 meters long. It takes a force of 75 newtons to push it to the top,which has a height of 3 meters. What is the efficiency?

  3. pysics

    ;A 20-N block lifted straight upward by a hand applying a force of 20 N. If the block is lifted 1 m, who much work does the hand do?

  4. Physics

    A 5.1–kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 25° above the horizontal, as shown below. (a) What is the acceleration of the block? (b) The force P is slowly

  1. Physics

    A baseball with a mass of 0.15 kilograms collides with a bat at a speed of 40 meters/second. The duration of the collision is 8.0 × 10-3 seconds. The ball moves off with a speed of 50 meters/second in the opposite direction. What

  2. solid mensuration

    a certain city block is in the form off parallelogram. two of it's side are each 225 meters long, the other two sides are each 145 meters long. if the distance between the first two pair is 80 meters. find the area of the land in

  3. physics

    Consider a block on an incline plane. The coefficients of static and kinetic friction between the block and the incline are µs = 0.353 and µk = 0.31. Calculate the critical angle θc, where the block just begins to slide. Answer

  4. science

    need help for quiz test A flowerpot weighs 5 newtons on Earth and 0.29 newtons on Pluto. A person weighs 115 newtons on Earth. Which proportion can you use to calculate this person’s weight on Pluto? Two scales A. 50.29=115w B.

You can view more similar questions or ask a new question.