0
Anne releases a stone from a height of 2 meters. She measures the kinetic energy of the stone at 9.8 joules at the exact point it hits the ground. What is the mass of the stone?
Wiki User
∙ 7y ago
The idea here is to assume that all the kinetic energy was originally (when the stone was at its highest point) gravitational potential energy. So, all you need to do is use the equation for gravitational potential energy, replace the numbers you know, and solve it for mass.
Wiki User
∙ 7y ago
Using the principle of conservation of energy, the initial potential energy when the stone was at a height of 2 meters (mgh) must have been equal to the final kinetic energy (1/2 * m * v^2) when it hits the ground. Thus, the mass of the stone can be calculated using the formula m = 2 * E / (g * h), where E is the kinetic energy (9.8 J), h is the height (2 m), and g is the acceleration due to gravity (9.81 m/s^2).
Substituting the values, the mass of the stone is m = 2 * 9.8 / (9.81 * 2) = 1 kg.
Wiki User
∙ 7y agoenergy is 9.8 joules or 9.8 newton-meters. at 2 meters weight is 9.8/2 = 4.9 Newtons. Mass is weight/9.8 (weight/gravity acceleration) so m = 4.9/9.8 = 0.5 kilogram
Add your answer:
Earn +20 pts
What type of energy is possessed by raindrops when they just falls on the ground?
The raindrops possess kinetic energy as they fall to the ground due to their motion. This kinetic energy is converted into potential energy when the raindrops hit the ground and come to a stop.
Give one example to show how potential energy can be converted to kinetic energy?
If you have an object on the roof it has potential energy of weight x height above the ground. When you drop it off the roof it is converted to kinetic enemy as it hits the ground, of value 1/2 its mass x velocity squared.
What does the kinetic energy of the object do as an object falls to the ground?
As an object falls to the ground, its potential energy decreases while its kinetic energy increases. This is because the object is converting its potential energy (due to its initial height) into kinetic energy (due to its motion). At the point of impact with the ground, all the initial potential energy is converted into kinetic energy.
As an object falls towards the ground what happen to the kinetic energy of the object?
As the object falls towards the ground, its gravitational potential energy decreases and is converted to kinetic energy. This means that the kinetic energy of the object increases as it gets closer to the ground.
When a falling stone hits the ground it's kinetic energy is?
When a falling stone hits the ground, its kinetic energy is mostly converted into sound energy, heat energy, and some energy used to break pieces of the ground.
What type of energy is possessed by raindrops when they just falls on the ground?
The raindrops possess kinetic energy as they fall to the ground due to their motion. This kinetic energy is converted into potential energy when the raindrops hit the ground and come to a stop.
Give one example to show how potential energy can be converted to kinetic energy?
If you have an object on the roof it has potential energy of weight x height above the ground. When you drop it off the roof it is converted to kinetic enemy as it hits the ground, of value 1/2 its mass x velocity squared.
What does the kinetic energy of the object do as an object falls to the ground?
As an object falls to the ground, its potential energy decreases while its kinetic energy increases. This is because the object is converting its potential energy (due to its initial height) into kinetic energy (due to its motion). At the point of impact with the ground, all the initial potential energy is converted into kinetic energy.
As an object falls towards the ground what happen to the kinetic energy of the object?
As the object falls towards the ground, its gravitational potential energy decreases and is converted to kinetic energy. This means that the kinetic energy of the object increases as it gets closer to the ground.
What is an example of energy flow?
Tide = Flow of kinetic energy from higher ground to lower ground Wind = Flow of kinetic energy from higher pressure to lower pressure Electricity = Flow of electrical energy (transfer of kinetic energy) from higher voltage to ground or low voltage.
When a falling stone hits the ground it's kinetic energy is?
When a falling stone hits the ground, its kinetic energy is mostly converted into sound energy, heat energy, and some energy used to break pieces of the ground.
What is an example of flow?
Tide = Flow of kinetic energy from higher ground to lower ground Wind = Flow of kinetic energy from higher pressure to lower pressure Electricity = Flow of electrical energy (transfer of kinetic energy) from higher voltage to ground or low voltage.
What is the kinetic energy of the free falling object that eventually stop on reaching the ground?
Once the object has reached the ground, its kinetic energy is zero.
Is a rock held above the ground kinetic energy?
No, a rock held above the ground does not have kinetic energy because it is not in motion. It instead has potential energy due to its position in the gravitational field ready to be converted to kinetic energy when released.
What happens the the kinetic energy of a falling object?
As a falling object descends, its potential energy (due to its position above the ground) is converted into kinetic energy (energy of motion). This kinetic energy increases as the object accelerates towards the ground. When the object reaches the ground, all of its potential energy is converted into kinetic energy.
Describe a stone falling off the tabletop in terms of both kinetic energy and potential energy?
Sitting on the table the stone has potential energy, relative to the ground, of weight times height, mgh. It has zero kinetic energy so its total energy is E = 0 + mgh. When it begins falling it loses potential energy (as it loses height) and gains kinetic energy ( as it picks up speed) so the sum stays the same as initially E = KE + PE = mgh. Just before it hits the ground all of its potential energy is gone and has been transformed into kinetic energy. So the kinetic energy at the bottom (1/2)mv^2 will equal the potential energy at the top.
What forms of energy are present when a walnut falls?
When a walnut falls, potential energy is converted to kinetic energy. The potential energy comes from the height of the walnut above the ground, while the kinetic energy is the energy of motion as the walnut falls towards the ground.
