- #1
Patrickas
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Homework Statement
80kg mass man is swinging on a swing. His amplitude is 1m. in 60 seconds he does 15 swings. Find the potential and kinetic energy after 1/12 period.
Patrickas said:Homework Statement
80kg mass man is swinging on a swing. His amplitude is 1m. in 60 seconds he does 15 swings. Find the potential and kinetic energy after 1/12 period.
Homework Equations
W(p)=mgh or kx^2/2 W(k)=mv^2/2 W(max)=Fr^2mg/2l
The Attempt at a Solution
i Found out that maximum energy is 100J. But when i am calculating energy of petencial or kinetic i get 1/3 or 2/3 of maximum...or something even more horrid. =]
Patrickas said:oh c'mon! there must be someone out there knowing how to do this...
tiny-tim said:Hi Patrickas!
(try using the X2 tag just above the Reply box )
erm … you can't post around 2am New York time and expect an answer 4 hours later!
anwyay, show us your full calculations, and then we'll see what went wrong, and we'll know how to help.
tiny-tim said:Show us your full calculations, and then we'll see what went wrong, and we'll know how to help.
tiny-tim said:Hi Patrickas!
You're making this very complicated.
You know T = 4, A = 1, and so distance x = 1*cos(2πt/4).
So you can find v … then KE = 1/2 mv2, and PE = … ?
Potential energy is the stored energy an object has due to its position or state. In the case of a man on a swing, potential energy is the energy he possesses while sitting at the highest point of the swing.
Kinetic energy is the energy an object possesses due to its motion. In this scenario, the man on the swing has kinetic energy while moving back and forth on the swing.
Potential energy can be calculated by multiplying the mass of the object by the acceleration due to gravity (9.8 m/s²) and the height of the object from the ground. In this case, the potential energy of the man on the swing would be 80kg x 9.8 m/s² x height.
Kinetic energy can be calculated by multiplying the mass of the object by the square of its velocity and dividing by 2. In the case of the man on the swing, the kinetic energy would be 80kg x (velocity)² / 2.
The potential and kinetic energies of the man on the swing are affected by his mass, the acceleration due to gravity, and the height and velocity at which he is swinging. Additionally, external factors such as air resistance and friction may also affect his energies.