# Vibration and Waves

posted by .

1. A girl on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is
1. (0.5 hertz)
3. (2 hertz)
And the period is (FROM THE QUESTION BEFORE)
2. (1 second)
3. (2 seconds)

2. The period of a 444-hertz sound wave is _____ second(s).

3. A marine weather station reports waves along the shore that are 8 seconds apart. The frequency of the waves is therefore _____ hertz.

4. The annoying sound from a mosquito occurs because it beats its wings at the average rate of 600 wingbeats per second.
( a.) What is the frequency of the soundwaves?
( b.) What is the wavelength? (Assume the speed of sound is 340 m/s.)

5. When an automobile moves towards a listener, the sound of its horn seems relatively _____
2. Low pitched
3. Normal
When moving away from the listener, its horn seems ______
1. High pitched
3. Normal

6. The changed pitch of the Doppler Effect is due t changes in_______
1. Wave Speed

Thanks so much for the help!!

## Similar Questions

1. ### Physics

Calculate the period of the wave if it makes 10 vibrations in 2 seconds. Does anyone know the formula for this?
2. ### Physics

A 21-kg child swings on a playground swing 3.4 m long. What is the period of her motion?
3. ### Physics

1) A child on a playground swing makes a complete to-and-fro swing each 2 seconds. The period is: 0.5 Seconds 2 Seconds I think the answer is 2. Am I correct?
4. ### Science

1. A girl on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is 1. (0.5 hertz) 2. (1hertz) (ANSWER) 3. (2 hertz) And the period is (FROM THE QUESTION BEFORE) 1. (0.5 seconds) (ANSWER) 2. …
5. ### algebra

Time to swing. The period T (time in seconds for one complete cycle) of a simple pendulum is related to the length L (in feet) of the pendulum by the formula 8T^2=n ^2 L. If a child is on a swing with a 10 foot chain, then how long …
6. ### physics

A child swings on a playground swing. How many times does the child swing through the swing's equilibrium position during the course of 3 period(s) of motion
7. ### physics

A young girl is on a swing that completes 20.0 cycles in 25 seconds. What are its frequency and period?
8. ### Physics

A baby turtle swings on a playground swing. If his turtle mom comes and sits with him, the period of the swing's oscillation will: a.Increase b.Decrease c.Stay the same
9. ### Pre Calc

simon goes to the playground to play on the swings. The length of each swing is 1.75m. What is the distance travelled on one swing, from max height to the next max height if the central angle of the swing is 1.4 rad?
10. ### Physics Pendulum

1. Many pendulums used in clocks are made of a thin metal bar with a very thin (in the plane of oscillation) adjustable bob. a) Why the emphasis on a thin bar and bob?

More Similar Questions