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As Energy is a conservative Force, the total Energy of a system is the Potential Energy plus the Kinetic Energy.
In terms of gravity, the Potential Energy, U, is the mass of an object times the acceleration due to gravity times the height of the object: U = m * g * h.
The Kinetic Energy is one-half the mass of the object times the square of its velocity: K = 1/2 * m * v2
The equation, then, is E = U + K.
An example:
If an object of 50 kg is suspended, at rest, 100 m above Earth, the equation will be U + K = 0, since it is not moving. Then, to solve:
U + K = 0 => U = - K => m * g * h = - 1/2 * m * v2
the mass of the object will cancel, and we'll round gravity to 10 m/s2, giving us
10 m/s2 * 100 m = - 1/2 * v2 => - 2 * 1000 m2/s2 = v2
v2 = - 2000 m2/s2 => v = 44.72 m/s
The negative sign does not indicate a negative velocity, but the direction of the velocity vector, in this case, down.
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∙ 13y ago
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How do find gpe when you have velocity?
To find gravitational potential energy (GPE) when you have velocity, you need to know the height of the object. You can use the formula ( GPE = mgh ), where ( m ) is the mass of the object, ( g ) is the acceleration due to gravity, and ( h ) is the height. First, calculate the object's kinetic energy using ( KE = 0.5 mv^2 ), then use the total energy (GPE + KE) to find the GPE.
Why 12.0 kg rock slides off the edge of a bridge and falls into the water 25.0 meters below. What is the kinetic energy of the rock just as it hits the water?
The gravitational potential energy of the rock at the edge of the bridge is converted to kinetic energy as it falls. Use the formula for gravitational potential energy (mgh) to find the potential energy at the top, then equate that energy to the kinetic energy (1/2 * m * v^2) just before impact to solve for the final velocity. Finally, use this velocity in the kinetic energy formula to calculate the kinetic energy just as it hits the water.
What is the mass of a skater if the potential energy is 600j velocity is 5ms height is 6?
To find the mass of the skater, we can use the formula for potential energy: Potential energy = mass x gravity x height. Given that potential energy is 600 J, height is 6 m, and gravity is 9.8 m/s^2, we can rearrange the formula to solve for mass: mass = Potential energy / (gravity x height). Plugging in the values, we find the mass to be approximately 10 kg.
What is the velocity of an 500 kg elevator that has 4000 J of energy?
4m/s
How can you find the initial velocity form the work done on a system?
To find the initial velocity from the work done on a system, you can use the work-energy principle. The work done on the system is equal to the change in kinetic energy of the system. By equating the work done to the change in kinetic energy and solving for the initial velocity, you can find the initial velocity of the system.
When to use law of momentum to find velocity rather than law of conservation of energy?
Use the law of momentum to find velocity when dealing with collisions or interactions between objects where momentum is conserved. Use the law of conservation of energy to find velocity in scenarios involving potential and kinetic energy transformations, such as objects moving on inclined planes.
How do you find velocity with charge and joule?
To find velocity with charge and joules, you would need additional information such as the mass of the object or particle carrying the charge. Once you have the mass, you can use the formula for kinetic energy, which incorporates velocity, charge, and energy (in joules) as factors to solve for velocity.
How can you find the kinetic energy without velocity in the question?
To find kinetic energy without velocity, you can use the formula for kinetic energy, which is KE = 0.5 * m * v^2, where m is the mass of the object and v is the velocity. If velocity is not given, you will need additional information, such as the height from which an object falls (in the case of gravitational potential energy) or the force applied over a distance (in the case of work-energy theorem), to calculate kinetic energy without velocity.
What is the initial arclength of a pendulum when you know the length and mass and max velocity and initial height of the pendulum?
The initial arclength of the pendulum can be calculated using energy conservation principles, taking into account the pendulum's potential and kinetic energy at the start. The formula to calculate initial arclength can be derived from the conservation of mechanical energy equation. The initial potential energy will be equal to the sum of kinetic and potential energy at maximum velocity.
What do you know about interconversion of energy of kinetic energy and potential energy of free falling bodies?
As a free-falling body moves downwards, it converts its initial potential energy into kinetic energy. At the lowest point of free fall, all of the initial potential energy is converted into kinetic energy. As the body rises back up, this kinetic energy starts converting back into potential energy until the body reaches its initial height, where all the kinetic energy is converted back to potential energy. This interconversion follows the principle of conservation of mechanical energy.
What is the name for energy that is not in use?
Potential Energy
If you have a kinetic energy of 45 j and your mass is 30kg then what is your velocity?
To find the velocity, you can use the equation for kinetic energy: KE = 0.5 * mass * velocity^2. Rearranging the equation gives 45 = 0.5 * 30 * velocity^2. Solving for velocity gives velocity = √(2 * 45 / 30) = √3 = approximately 1.73 m/s.
