Physics: Fluids, Waves, and Resonance Review

2. Exam 1 Review • Fluids— Density Pascal’s Law, Pressure vs. depth Buoyant force Equation of continuity Bernoulli’s (pressure, velocity, depth) 2. Waves— Transverse vs. longitudinal waves Frequency, period, wavelength Waves on strings, sound waves Antinodes, nodes Doppler effect (sound and light) Pipes and strings—Resonances

3. Fluid Statics

5. Extra Credit Home Activity: A Helium Balloon is tied to the floor of a car. When the car stops, which direction does the balloon move? • Toward the front of the car. • Toward the back of the car. • Toward the left of the car. • Toward the right of the car. • Stays in the same place relative to the rest of the car.

6. A block of wood floats in a bowl of water. On top of the block there is a lead weight attached. The block turns over so that the lead weight is under water still attached to the floating block. When this happens, the water level in the bowl (a) goes down. (b) remains unchanged. (c) goes up.

7. A crate is placed in a boat. The boat sinks a little to displace more water, but doesn’t “sink.” What can you say for sure about the amount of new water displaced? • It has the same volume as the crate • It has less volume than the crate • It has more volume than the crate • It has a weight less than the crate’s weight • It has a weight equal to the crate’s weight • It has a weight greater than the crate’s weight

8. Discussion question: A glass is filled to the top with ice and water. When the ice melts, where is the water level? • Above the rim so it spills over. • At the rim—same place as before. • Below the rim

9. Fluid Dynamics

10. Blood flows through a coronary artery that is partially blocked by deposits along the artery wall. Through which part of the artery is the flow speed largest? • The narrow part. • The wide part. • The speed is the same in both parts.

11. A blood platelet drifts along with the flow of blood through an artery that is partially blocked by deposits. As the platelet moves from the narrow region to the wider region, it experiences • an increase in pressure • no change in pressure • a decrease in pressure

12. Waves Basics

13. Waves On Strings

14. Two strings, one thick and the other thin, areconnected to form one long string. A wavetravels along the string and passes the pointwhere the two strings are connected. Whichof the following does not changes at that point: • frequency • velocity • wavelength

15. Joshua 1:9 • Have not I commanded thee? Be strong and of a good courage; be not afraid, neither be thou dismayed: for the Lord thy God is with thee whithersoever thou goest.

16. Sine Waves

17. You hear a violinist playing a series of notes on a string of decreasing wavelength. As the wavelength decreases, the wave speed in the string • Decreases • Increases • Stays the same

18. A sinusoidal wave propagates on a string. The tension in a string remains fixed, but the frequency is doubled. What happens to the wavelength? (a) The wavelength is halved. (b) The wavelength remains unchanged. (c) The wavelength is doubled.

19. Standing Waves

20. Intensity

21. A sound increases from 50dB to 90dB. How much does the intensity increase? (a) 40 times. (b) 400 times. (c) 10,000 times. (d) 40,000 times. (e) other.

22. Resonance

23. Doppler Shifts

24. Windy Day

25. A stationary observer hears a pitch from a source that moves towards him, the observed frequency will be ____________ the source frequency • Lower than • The same as • Higher than