1 Which statement BEST describes how a golf club does "work" on a golf ball? (A) When the club hits the ball the club transfers
1 answer:
Answer:
(C) Some of the kinetic energy from the golf club is transferred to the ball and some transforms into sound and heat, but the total energy remains the same.
Explanation:
According to the law of conservation of energy, the total energy of a closed system is constant.
In this problem, the main type of energy involved is the kinetic energy.
Kinetic energy is the energy possessed by an object due to its motion; mathematically, it is calculated as
where
m is the mass of the object
v is its speed
In this problem, at the beginning, the golf club is moving, therefore it has kinetic energy.
Then, the club hits the ball, which is put in motion: therefore, the ball has acquired kinetic energy as well. This energy has been transferred from the golf club, which has therefore lost part of its energy.
At the same time, sound and heat are produced in the collision between the golf club and the ball. Since the total energy must be conserved, this means that the initial kinetic energy of the golf club must be equal to the sum of ball's kinetic energy + sound energy + heat energy released in the collision.
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To solve this problem we will use the trigonometric concepts to find the distance h, which will allow us to find the speed of Jeff and that will finally be the variable that will indicate the total tension, since it is the variable of the centrifugal Force given in the vine at the lowest poing of the swing.
From the image:
When Jeff reaches his lowest point his potential energy is converted to kinetic energy
Tension in the string at the lowest point is sum of weight of Jeff and the his centripetal force
Therefore the tension in the vine at the lowest point of the swing is 842.49N
