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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the electric force decreases because the distance has an indirect relationship to the force
Explanation:
The electric force between two objects is given by
where
k is the Coulomb's constant
q1 and q2 are the charges of the two objects
r is the distance between the two objects
As we can see from the formula, the magnitude of the force is inversely proportional to the square of the distance: so, when the distance between the object increases, the magnitude of the force decreases.
Answer:
1.1397 Nm
Explanation:
When the palmaris longus muscle in the forearm is flexed, the wrist moves back and forth.
If the muscle generates a force
and
, then the torque is equal to
we see that r = 2.65 cm = 0.0265 m
therefore
torque = 0.0265 x 49.5
= 1.1397 Nm
As it is given that the air bag deploy in time
total distance moved by the front face of the bag
Now we will use kinematics to find the acceleration
now as we know that
so we have
so the acceleration is 400g for the front surface of balloon