1. Questions

Physics

A ball of mass 522 g starts at rest and slides down a frictionless track, as shown below. It leaves the track horizontally, striking the ground a distance x = 0.81 m from the end of the track after falling a vertical distance h2 = 1.03 m from the end of the track. (a) At what height above the ground does the ball start to move?
(b) What is the speed of the ball when it leaves the track?
(c) What is the speed of the ball when it hits the ground?

  1. 👍
  2. 👎
  3. 👁
Angela

  1. m•g•h1=m•v²/2
    v=sqrt(2•g•h1)=v(x)
    t=x/v =x/v(x) =x/ sqrt(2•g•h1)

    h2=g•t²/2=g• x²/ 2•2•g•h1=x/4•h1 =>
    h1=x/4•h2=0.81/1.03 =0.79 m

    (a) H=h1+h2= 1.03+0.79=1.82 m.

    (b) v=v(x)=sqrt(2•g•h1)=
    =sqrt(2•9.8•0.79) = 3.93 m/s.

    (c)
    t=x/v(x)=0.81/3.93 = 0.2 s.
    v(y) = gt=9.8•0.2= 1.96 m/s.
    v=sqrt{v(x)²+v(y)²} = sqrt(3.93²+1.96²) = 4.4 m/s.

    1. 👍
    2. 👎
    Elena

  2. Those were all wrong, I don't get it.

    1. 👍
    2. 👎
    Angela

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics (Algebra-based)

    A block starts at rest and slides down a frictionless track except for a small rough area on a horizontal section of the track.It leaves the track horizontally, flies through the air, and subsequently strikes the ground. gravity=

  2. Physics

    Problem 2- A 350 kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the figure. a) How fast is the roller coaster moving at point B? b) How hard does it press against the track at

  3. Physics

    A novice skier starts from rest and slides down a frictionless 35 degree incline whose height is 125 m. How fast will she be going at the bottom?

  4. physics

    A .400 kg bead slides on a curved wire, starting from rest at point A. If the wire in problem 61 is frictionless between points A and B (down 5m) and rough between B and C (up 2m), and if the bead starts from rest at A, (a) find

  1. Physics

    A block starts at rest and slides down a fric- tionless track. It leaves the track horizontally, flies through the air, and subsequently strikes the ground.What is the speed of the ball when it leaves the track? The acceleration

  2. physics

    A block of mass 12.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 1.50 104 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the

  3. Physics

    A boy starts at rest and slides down a frictionless slide as in the figure below. The bottom of the track is a height h above the ground. The boy then leaves the track horizontally, striking the ground a distance d as shown. Using

  4. physics

    A small cube of mass m1= 1.0 kg slides down a circular and frictionless track of radius R= 0.4 m cut into a large block of mass m2= 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table.

  1. Science

    A 0.2 kg object is released from rest at point A on a track that is one-quarter of a circle with radius 1.6 m, as shown in the figure. It slides down and reaches point B with a speed of 4.8 m/s. Then it slides on a level surface a

  2. Physics

    A small block of mass m = 1.3 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 54.0 m above the bottom of the loop of radius R = 19.0 m. What is the kinetic energy

  3. physics

    In Figure 8-50, a block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level, where a frictional force stops the

  4. Physics

    a sled starts from rest and slides down a 38.0 degree frictionless hill for 4.24 seconds. How fast is it going at the end

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