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A ball is dropped from a height of 1.60 m and rebounds to a height of 1.30 m How many rebounds will the ball make before losing at least 90 percent of its energy?
Wiki User
∙ 13y ago
Energy can be looked at at the apex of the ball's bounce and is proportional to h. Therefore, the energy retained between the first two bounces = 1.3/1.6 = 81%
Therefore, it loses about 19% of its energy per bounce.
To lose 90% means to retain 10% of the energy
0.8125^x=.1
x=log(.1)/log(.8125)
round up
12 rebounds
Wiki User
∙ 13y ago
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Why does a body exerts more force on ground when it is dropped from a certain height than when it at rest at the ground although in both the cases mass and acceleration is constant See discussion too?
Interesting question. But when the object is at rest the potential energy of the object is 0, on the surface that is. When it is on a height h it's potential energy increase and when it is dropped from that height all that potential energy gets converted to kinetic energy just before hitting the ground. This extra force comes from this kinetic energy.
If A rubber ball is dropped on the floor what force causes it to bounce?
kinetic and potential energy.
Describe the energy transformation that occur when you bounce a ball?
When the ball hits the ground, kinetic energy is turned into potential energy and stored momentarily as the ball compresses. As the ball rebounds, the potential energy is converted back to kinetic energy. Some energy is also lost in the form of heat and air waves (sound). This continues with each bounce and due to the loss of energy, the ball gradually stops bouncing.
What type of energy is used before and after a ball is bounced?
Gravitational potential energy before the ball is bounced which changes to kinetic energy and then to elastic potential energy.
What percent of energy is lost as heat?
Ninety percent of energy is lost as heat when an organism is consumed. for example if i ate an apple with 1,000 goels of energy,I'll only get 100 goels of energy.Then if a lion were to eat me, it would only get 10 goels of energy.The rest is lost as heat energy.
As a dropped penny falls toward the ground energy is converted to energy?
Since the penny was up and stationary before (in your hand or wherever), it had potential energy at first. When it's dropped, it is converted into kinetic energy (energy of motion).
How do you measure a dropped ball's potential energy?
When a ball is dropped, it no longer has potential energy. Before it drops, you can calculate the potential energy (= mgh); to actually measure this, you would have to measure the force, and multiply that by the distance.
If 100 percent of the balls kinetic energy were converted back to potential energy how high would the ball bounce?
The ball would bounce back to where it was dropped.
What energy does a marble have when it is dropped?
Kinetic energy is moving energy
What is the kinetic energy of a ball when it is dropped from a height and it falls on a table?
it is the difference of the potential energy when the body is on the table and from the position where it is dropped.
What is kynetic energy?
kinetic energy is the amount of energy something has when it is moving. It is measured in Joules (J) it is found by : ke=1/2 mv2`where m=mass in kilograms and v=velocity the gravitational potential energy (gpe) of something before it is dropped = mgh where m=mass in kilograms, g=gravitational field strength (constant at 9.81Nm2) and h =height of object in metres. ke exactly before it hits the ground = gpe before it is dropped from this we can see that 1/2 v2 =gh
How was nuclear energy used in the past?
The nuclear energy first used was I suppose the A-Bomb dropped on Hiroshima, and it had a bad effect on the people who lived there.
Which energy transformation that takes place when a ball is dropped to the floor?
Kinetic Energy
What is the kinetic energy of an object weighing 65 kg dropped from a height of 40m?
Kinetic energy is dependent on which point you are talking about. When it is about to be dropped, kinetic energy is zero. When it reaches almost hits the ground, there is maximum kinetic energy.
What is the percent of energy used by the prey in an energy pyramid?
twenty percent
What happened before the 1950s that would become instrumental in the development of nuclear energy in the future?
The atom was split successfully in early 1940s. In 1945, nuclear bombs were dropped on Japan and thereafter nuclear energy began being used for local energy.
Why would the final kinetic energy before impact be less the initial potential energy of an object dropped from a kilometer height?
It is easiest to think of initial potential energy as the "distance" the object is able to fall. If it has not fallen the distance yet, then of course kinetic energy would be less.
