A baseball player throws 4 balls every 20 seconds. what is his throw frequency
1 answer:
Answer:
Frequency, f = 0.2 Hz
Explanation:
We have,
A baseball player throws 4 balls every 20 seconds.
It is required to find the frequency of the baseball.
Frequency of an object is defined as the number of times an event occurs. It is given by number of throws per unit time. It can be given by :
So, the frequency of his throw is 0.2 Hz.
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The two objects after (b) are at the same potential
Explanation:
When the two conducting objects are connected together, charge will be transferred from one object ot another until the two objects reach the same potential.
In fact, if there is still some residual potential difference between the two objects, there would still be a net electric field pushing the charges from one object to the other. Therefore, equilibrium is reached only when the net electric field between the two objects becomes zero, and this occurs only when the potential difference is zero, so when the two objects are at the same potential.
At the equilibrium, however, the charge on the two objects can be different. In fact, the capacity of an object is given by
where Q is the charge stored by an object and V is its potential. It can be re-arranged as
The two objects are at same potential, V, however their capacity C can be different since the two objects are not identical: therefore, their stored charge can be different.
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Answer:
The velocity
Explanation:
For a mass-spring system, the total mechanical energy is constant during the motion. The total mechanical energy is sum of the elastic potential energy, U, and the kinetic energy, K:
where
k is the spring constant
x is the displacement
m is the mass
v is the velocity
Since E must remain constant, we see that when x increases, v decreases, and vice-versa. Therefore, when x (the displacement) is at maximum, v (the velocity) is at minimum (more precisely, it is zero).