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Answer:
C. The number of waves that pass a particular point in a unit of time.
Explanation:
The number of waves that pass a fixed point in unit time and the number of cycles or vibrations undergone during one unit of time by a body in periodic motion is called as frequency.
A body in periodic motion is said to have undergone one cycle or one vibration after passing through a series of events or positions and returning to its original state.
The unit of frequency is Hertz.
Answer:
B. When the racket hits the tennis ball with a force, the tennis ball applies an equal but opposite force to the racket.
Explanation:
According to the Newton's third law of motion every action has equal and opposite reaction. So, when the force is applied by the racket on the ball then the ball also applies an equal intensity of force in the opposite direction on the racket. It is just that the the force on the racket is absorbed by the player holding it.
Answer: yes u can use a 6.75 when measuring the pencil