Ask questions and get helpful answers.
Ask a New Question
  1. Questions
  2. Physics

A solid rubber ball has a diameter of 8.0 cm. It is released from rest with the top of the ball 80 cm above a horizontal surface. It falls vertically and then bounces back up so that the maximum height reached by the top of the ball is 45 cm, as shown.

80 60 40 20
If the kinetic energy of the ball is 0.75 J just before it strikes the surface, what is its kinetic energy just after it leaves the surface?

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
Jeevan
4 answers

  1. Unless I misunderstood the numbers, the value 45 cm does not match the sequence 80,60,40,20.
    Please check or clarify.

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    MathMate

  2. the 45cm is supposed to be between 60cm to 40cm. The question is correct. Anyone who can help me in this too?

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Nmk

  3. It says top of the ball, so you need to minus both of the heights by 8cm.
    h1 = 0.8 -0.08 = 0.72
    It is given that kinetic energy before striking the surface is 0.75 J. So you just nid to use potential energy formula(mgh) to calculate the mass of the ball .

    h2 = 0.45 - 0.08 = 0.37
    Use the mass that you had calculate and formula mgh again to count the kinetic energy after it leaves the surface.

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    may

  5. .45-.04=0.41
    .80-.04=.76
    (.41/.76)×0.75
    =0.39

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    GeeksWork

Answer this Question

Related Questions

  1. physics

    Consider the line passing through the center of the cue ball as the x axis. At the point of collision with the solid ball on the table, a line passing through the centers of the cue ball and the solid ball form a 45° angle with the X axis. Assume no

  2. Physics

    When the rubber band in a slingshot is stretched, it obeys Hooke's law. Suppose that the "spring constant" for the rubber band is k = 44.2 N/m. When the rubber band is pulled back with a force of 9.38 N, how far does it stretch?

  3. Chemistry

    According to the rules of golf, a golf ball cannot weigh more than 45.97 grams, and it must be at least 4.267 cm in diameter. The volume of a sphere is (4/3)πr3, where r is the radius. What is the density of a 45.67 g golf ball with a diameter of 4.267

  4. Physics

    a solid ball and a cylinder roll down an inclined plane. which reaches the bottom first? A. The ball reaches the bottom first. B. The cylinder reaches the bottom first C. They arrive at the bottom at the same time D. It depends on the incline of the slope

  5. Physics

    A baseball is released at rest from the top of the washington Monument. It hits the ground after falling for 6.0 s. What was the height from which the ball was dropped? (g=9.8 m/s2 and assume air resistance is negligible)

  6. physics

    A billiard ball traveling at 8.0 m/s has an elastic collision with a second billiard ball of equal mass that is at rest. After the collision, the first ball is at rest. What is the velocity of the second ball after the collision?

  7. Science

    A scientist wants to drop a bouncy ball from a height of one meter and determine how many times the ball will bounce before coming to restWhich option below is an example of a hypothesis for this test? A. If a bouncy ball is dropped , it will bounce one

  8. Science

    A scientist wants to drop a bouncy ball from a height of one meter and determine how many times the ball will bounce before coming to rest Which option below is an example of a hypothesis for this test? A. If a bouncy ball is dropped, it will bounce one

  9. Mathematics -- Geometry --

    A bowling ball is a solid ball with a spherical surface and diameter 30 cm. To custom fit a bowling ball for each bowler, three holes are drilled in the ball. Bowler Kris has holes drilled that are 8 cm deep and have diameters of 2 cm, 2 cm, and 3 cm.

  10. Physics

    A player throws a ball at an initial velocity of 36 m/s. The maximum distance the ball can reach (assume ball is caught at the same height at which it was released) is? (I tried to solve it but i think it doesn't have all the information needed to slove

Still need help?

You can ask a new question or browse existing questions.