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Today’s Warm-UP

Today’s Warm-UP. READ today’s handout. Complete CRCT Warm-ups for today. Today’s Warm-UP. The amount of energy produced during nuclear fission (splitting atoms in two) is related to the temperature in the atmosphere during nuclear fission.

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Today’s Warm-UP

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  1. Today’s Warm-UP • READ today’s handout. • Complete CRCT Warm-ups for today.

  2. Today’s Warm-UP • The amount of energy produced during nuclear fission (splitting atoms in two) is related to • the temperature in the atmosphere during nuclear fission. • the masses of the original nuclei and the particles released. • the volume of the nuclear reactor. • the square of the speed of sound.

  3. Today’s Warm-UP • Temperature is proportional to the average kinetic energy of particles in an object. Thus, an increase in temperature results in a(n) • increase in mass. • decrease in average kinetic energy • increase in average kinetic energy. • decrease in mass.

  4. Today’s Warm-UP • What determines an object’s thermal energy? • the motion of its particles • its size • its potential energy • its mechanical energy

  5. Today’s Warm-UP • When you hit a nail into a board by using a hammer, the head of the nail gets warm. In terms of kinetic and thermal energy, describe why you think the nail head gets warm.

  6. Today’s Warm-UP • Explain why a high-speed collision may cause more damage to vehicles than a low-speed collision does.

  7. Waves A wave is a rhythmic disturbances that carry energy through matter or space.

  8. Waves A wave does work on everything in its path.

  9. Waves Wave Classification Group #1 Waves that require a medium Group #2 Waves that do not require a medium

  10. Group 1 Waves that require a Medium A medium may be a gas, a solid, or a liquid. Simply put a medium is the material through which a wave transfer energy.

  11. Waves that require a Medium • Wave that require a medium • Examples • 1. Ocean waves • 2. Earthquakes

  12. Mechanical Waves – Group 1 • Cause rhythmic disturbance in the medium • Travel through medium • Transmit energy • Leave the medium unchanged after the wave passes

  13. Group 2 Waves that do not require a Medium • These waves do not require matter for transfer energy. • Transmit energy

  14. Waves that do not require a Medium Examples 1. Radio waves 2. Visible light

  15. Characteristics of Waves 1. Different Movements of Waves 2. Physical Characteristics a Transverse Wave 3. Calculation of Wave Velocity

  16. 1. Different Movements of Waves • Transverse waves – Medium moves at right angles to the direction of the wave • Longitudinal or CompressionalWaves – Medium moves in the same direction as the waves are moving

  17. 1. Different Movements of Waves • Transverse waves – Medium moves at right angles to the direction of the wave

  18. 1. Different Movements of Waves • Longitudinal or CompressionalWaves – Medium moves in the same direction as the waves are moving

  19. 2. Physical Characteristics A. Crest The highest point of a wave Label the drawing as we introduce the parts of the wave

  20. 2. Physical Characteristics A. Crest The highest point of a wave

  21. Physical Characteristics B. Trough The lowest point of a wave

  22. Physical Characteristics C. Wavelength a) The distance between a point on one wave and the identical point on the next wave.

  23. Physical Characteristics C. Wavelength b) Represented by the Greek letter lambda λ

  24. Physical Characteristics D. Amplitude The distance from the crest or trough of a wave to the rest position.

  25. Physical Characteristics E. Frequency a. The number of waves crests of a wave that pass one place in one second

  26. Physical Characteristics • Frequency • Frequency is measure in hertz (Hz). • One hertz = one wave per second

  27. Physical Characteristics Frequency c. Frequency is represented by the letter f.

  28. Physical Characteristics Frequency d. Example A: If ten wave crests pass a point every five seconds, what is the frequency of the wave?

  29. Physical Characteristics Frequency d. Example A: If ten wave crest pass a point every five seconds, what is the frequency of the wave? f = ten waves / 5 seconds f = 2 hertz

  30. Calculation of Wave Velocity Formula: Velocity = wavelength x frequency v =

  31. Practice Problems 1. A wave moving along a rope has a wavelength of 1.2 m and a frequency of 4.5 Hz. How fast is the wave traveling along the rope?

  32. Practice Problems Example: A wave generated in a wave pool at a water amusement park. The wavelength is 4.0 m. The frequency of the wave is 0.50 Hz. What is the velocity of the wave?

  33. Fan-n-Pick Okay seat partners…. Write your answers to the next two questions on a small white board. Do not reveal your answers until asked to do so.

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