Physics

posted by .

You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 69 m above the surface of the lake. You dive of the cliff doing somersaults so as to have an angular speed of 5.5 rev/s. How many revolutions do you make before you hit the water? Assume your initial centre of mass velocity is horizontal and you begin from a standing position.

  • Physics -

    so, the only thing to calculate is the time to fall.

    Multiply that by 5.5 to get the revs.

    Hmmm. How about the old s = 1/2 at^2

    Sloppy language. The center of mass is a point, and cannot be horizontal. Assume the velocity is horizontal, so there is no initial vertical component.

    And watch out for those rocks at the bottom of the cliff!!! That's where the horizontal velocity comes in. :-)

    And, the water better be shallow. At 5.5rev/s you'll be too dizzy to swim when you hit!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A boy sitting on the edge of a vertical cliff fires a rock with a slingshot at a velocity of 16.45758956 m/s and an angle of 59.78 degrees above the horizontal. The rock lands in a lake at the base of the cliff, a horizontal distance …
  2. physics

    A boy sitting on the edge of a vertical cliff fires a rock with a slingshot at a velocity of 16.45758956 m/s and an angle of 59.78 degrees above the horizontal. The rock lands in a lake at the base of the cliff, a horizontal distance …
  3. General Physic

    The time it takes for an object dropped from the top of cliff A to hit the water in the lake below is twice the time it takes for another object dropped from the top of cliff B to reach the lake. If it takes 2.30 s for the object to …
  4. Physics

    You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 36m above the surface of the lake. You dive off the cliff doing somersaults so as to have an angular speed of 6rev/min. How many revolutions …
  5. Physics

    A person, standing on a vertical cliff a height h above a lake, wants to jump into the lake but notices a rock just at the surface level with its furthest edge a distance s from the bottom of the cliff. The person realizes that with …
  6. physics

    a bullet is fired horizontally from the top of a cliff that is 30m above a long lake. if the horizontal speed of the bullet is 600 m/s, how far from the bottom of the cliff does the bullet strike the surface of the lake ?
  7. Physics

    a bullet is fired horizontally from the top of a cliff that is 15 m above a long lake. if the muzzle speed is 478, how far from the bottom of the cliff does the bullet strike the surface of the lake
  8. Physical

    At t = 0 s time a stone is thrown from the top of a cliff above a lake. Another stone is thrown down from the same point , 1.6 s later , with a initial velocity of 32.0 m / s. The two stones hit the water in one instant. Determine …
  9. Trig

    While fishing on a lake, the fisherman looks up at a cliff. His boat is 23 ft from the base of the cliff, and the angle of elevation is 40 degrees. Find the height of the cliff to the nearest tenth of a foot.
  10. physics

    A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.20 s after shouting. How long (in meters) is the lake?

More Similar Questions