science

posted by .

I'm having trouble with identifying simple machine.
1)A row boat
2)saw
3)an arm flexing
4)a person hiking
5)a person catching
6)a bikes wheel
Help please!

  • science -

    It's 6, I think, the wheel. Look at all the other ones there: most of them have to do with people, who are most definitely not machines and not simple! A row boat is too big of a thing to be simple, and I don't think it's the saw. That leaves the wheel. Um, look at the note:
    Note: this is what I remember from 4th grade science. Don't quote me on it.

  • science -

    http://www.infoplease.com/ce6/sci/A0859409.html

  • science -

    the row boat is simple because it has rows that push the boat using the force of water as a levy to push it. Like a saw is not a machine just a tool, an arm is not a machine, a person hiking is not a machine, person catching is not a machine, wheel can be part of a machine but is not a machine in it's self.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    In a ferris wheel, one person is at the top and another at the bttom. The ferris wheel rotates such that the magnitude of the tangetial velocity of each person is equal |v|top=|v|bottom. Determine for the person at the bottom, the …
  2. Physics

    A person can row a boat at a rate of 25 m/s in still water. The person heads the boat directly across a stream that flows at a rate of 9 m/s. Find the resultant velocity of the boat.
  3. Physics

    Simple Machines A simple wheel and axle has a wheel diameter of 2.3m and an axle diameter of 92mm. If an effort of 26N is required to raise a mass of 16 kg what is the efficiency of the machine?
  4. Trigonometric Functions

    A person is riding a ferris wheel that turns at a constant speeed. The lowest point of the ferris wheel is at ground level. Another person is standing at the side of the wheel on a platform 4m above the ground. She notes the times …
  5. English

    1. Each team in the Boat Race has eight rowers and one more person who does not row, a cox. 2. Each team in the Boat Race is composed of eight rowers and one more person who does not row, a cox. 3. Each team in the Boat Race comprises …
  6. physics

    a person of mass 80 kg standing on a boat of mass 320 kg which at rest in still water the person is initially 12m from the shore the person walk on boat for 6 sec with a constant speed 1 m/s toward the shore and then stop distance …
  7. math

    There are 20 bikes in spinning class, the bikes are arranged 4 rows, with 5 bikes in each row. They hope to be in the same row, but cannot request specific bike. Determine the probability that all 5 friends will be in same row with …
  8. calculus

    A person can row at a constant speed of 6 miles per hour. If the rower wants to row directly across a river with a current of 2 mph, at what angle should they row?
  9. PHYSICS

    A person sits on a frictionless stool that is free to rotate but is initally at rest. The person holding a bicycle wheel (I = 3 kg*m2) that is 8 rev/s in the clockwise direction as viewed from above, and the moment of inertia of the …
  10. Algebra

    The chart below shows the average number of movies seen per person in selected countries. A chart is shown with 2 columns.The first column is titled Country. The second column is titled Average number of movies a person sees in a year. …

More Similar Questions