physics

A grandfather pulls his grandson, whose mass is 20kg and who is sitting on a swing with ropes of length 2.50m, backward and releases him from rest. The speed of the grandson at the bottom of the swinging motion is 3.0 m/s. What is the angle (in degrees measured relative to the vertical) from which he is released?

  1. 👍 0
  2. 👎 0
  3. 👁 182
  1. Try using conssrvation of energy.

    Hint: The change in elevation for an angle A from vertical is
    L (1 - cos A)
    where L is the rope length.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    In three more years, Miguel's grandfather will be six times as old as Miguel was. Last year, when Miguel's present age is added to his grandfather's present age the total is 68. How old is Miguel and his grandfather now? Miguel =

    asked by Anonymous on March 18, 2016
  2. physics

    a box with mass 20kg rests on a frictionless ramp with a 15degree slope. a mover pulls up on a rope attached to the box to pull it up the incline. if the rope makes a 40 degree angle with the horizontal, what's the smallest force

    asked by thalia on November 11, 2009
  3. PHYSICS - plz help

    A house painter uses a chair and pulley arrangement to lift himself up the side of a house. The painter's mass is 69.2 kg and the chair's mass is 24.0 kg. With what force must he pull down on the rope in order to accelerate upward

    asked by Anonymous on October 2, 2009
  4. Physics Prob.

    A 22.0 kg child plays on a swing having support ropes that are 2.00 m long. A friend pulls her back until the ropes are 45.0 ∘ from the vertical and releases her from rest. What is the potential energy for the child just as she

    asked by Justin on November 24, 2017
  1. Social Studies

    which of the following did NOT restrict voting rights of the African Americans after 1867? 1: Poll Tax 2: Literacy test 3: grandfather clause 4: Sharecropping I chose #4 is this correct? I was thinking grandfather clause, but they

    asked by Marylyn on May 7, 2015
  2. Physics

    A father pulls his son, whos mass is 25 kg and who is sitting on a swing with ropes of length 3 meters, backward until the ropes make an angle of 33.6 degrees with respect to the vertical. He then releases his son from rest. What

    asked by Khalid on December 17, 2015
  3. physical

    Tarzan of mass 80kg swings from rest on a rope of length 10m that is horizontal when he starts at the bottom of his swing his speed is 14m.second he picks up jane sitting on the ground in an inelastic collision jane has a mass of

    asked by Retyu Zintle on February 12, 2015
  4. Physics

    Betty weighs 427 N and she is sitting on a playground swing seat that hangs 0.22 m above the ground. Tom pulls the swing back and releases it when the seat is 0.88 m above the ground. The acceleration of gravity is 9.8 m/s2. How

    asked by brian on February 20, 2013
  1. College Physics

    Tarzan spies a 35kg chimpanzee in severe danger, so he swings to the rescue. He adjusts his strong, but very light, vine so that he will first come to rest 4.0 s after beginning his swing, at which time his vine makes a 12 degree

    asked by Jen on October 26, 2007
  2. Physics

    A plank 3m long and having a mass of 20kg is supported at its ends. Imagine that a person with a mass of 50 kg stands m from one end. What are the magnitudes of the force exerted by the supports?

    asked by Josh on November 26, 2016
  3. Physics

    A father pulls his son, whose mass is 27.3 kg and who is sitting on a swing with ropes of length 2.85 m, backward until the ropes make an angle of 36.8° with respect to the vertical. He then releases his son from rest. What is

    asked by Anonymous on October 24, 2014
  4. programming

    Application: Pendulum Clocks Pendulums used in clocks, such as grandfather clocks, keep fairly accurate time for the following reason: When the length of a pendulum is large compared with the maximum arc of its swing, the time to

    asked by fatih on October 4, 2012

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