psc2 104 ☈ Name:

Weather permitting, this test starts with a cloud quiz...

  1. Number one cloud name:
  2. Number two cloud name:
  3. Number three cloud name:
  4. For the next few questions the instructor should have brought a thermometer and tables of values. He will write some values on the board. Use those values for the questions below.

    _______°C What is the dry bulb temperature?
  5. _______°C What is the wet bulb temperature?
  6. _______°C What is the wet bulb depression?
  7. _______% Use a table to determine the relative humidity.
  8. _______°C Use a table to determine the heat index (the perceived temperature).
  9. ______________ What is the risk level for exercise: low, moderate, or high?
  10. A RipStik was swizzled ("wiggled") across a poster pad paper. The sinusoidal swizzle wave can be seen in the diagram below.
    RipStik swizzle sine wave 8 cm 30 cm RipStik rider

    λ = _________ _________ Determine the wavelength λ of one wave of the RipStik swizzle wave.
  11. a = _________ _________ Determine the amplitude a of the RipStik swizzle wave.
  12. τ = _________ _________ The RipStik took a duration of 0.30 seconds to travel the 30 centimeters seen on the diagram above. Determine the period τ for the RipStik swizzle wave.
  13. f = _________ _________ Calculate the RipStik swizzle wave frequency f.
  14. ѵwave = _________ _________ Use the wavelength λ and frequency f to calculate the velocity ѵwave of the RipStik swizzle wave.
  15. _________ How many wavelengths in all are there on the "paper" above?
  16. Bouncing ball ball arrows τ = _________ _________ A ball bounces 10 times in 4 seconds. What is the period of the bouncing ball?
  17. f = _________ _________ A ball bounces 10 times in 4 seconds. What is the frequency for the bouncing ball?
  18. τ = ________ _________ While gathering data for laboratory nine, a clapper clapping in synch with the echo claps 20 times in ten seconds. Based on this data, what is the period for the echo (the out-and-back time)?
  19. velocity ѵ = _________ _________ During ten seconds a clapper claps 20 times. The echo flight distance is measured as being 175 meters. Based on this data, what is the speed of sound?
  20. How do we know that the classroom can hear the boards hitting each other?
  21. Is the spectrum shown discrete | or | continuous?
    continuous spectra
  22. Is the spectrum shown discrete | or | continuous?
    discrete spectra
  23. List the seven colors of the Newtonian spectrum (the rainbow!) in order:

slope m= (y2−y1) (x2−x1)
Volume V = length l × width w × height h
mass m = density ρ × Volume V
ρ= m V
distance d = velocity ѵ × time t
ѵ= Δd Δt
a= Δѵ Δt
ѵ = at
d = ½at²
d = ½gt²
where g is the acceleration of gravity.
g = 980 cm/s² (cgs)
g = 9.8 m/s² (mks)
Gravitational Potential Energy = mgh
Kinetic Energy = ½mѵ²
momentum = mѵ
period τ = 1 ÷ (frequency f )
velocity ѵ = wavelength λ * frequency f

Relative humidity from dry bulb and wet bulb depression
Web bulb depression in °C: Dry bulb minus the wet bulb
Dry bulb T in °C 0.5 1.0 2.0 2.5 3.0 3.5 4.0 5.0
2195%90%83%79%77%72% 67% 60%
2496%91%84%80%78%74% 69% 62%
2796%91%85%81%78%75% 71% 65%
28 96% 93% 85% 82% 78% 75% 72% 65%
29 96% 93% 88% 84% 80% 76% 73% 66%
30 96% 93% 88% 84% 81% 76% 73% 67%
3296%93%89%85%81%78% 74% 68%
3596%93%89%85%82%79% 75% 69%
3896%93%89%86%83%80% 76% 71%
Heat index as an effective temperature in °C given a dry bulb temp. and Rel. Hum.
Dry bulb temperature in °C
Relative humidity 212427282930313235
60% 21242829.5 32 33 35 38 46
70%21252930.7 34 35 37 41 51
80%22263032.1 36 38 40 4558
90%22263133.7 39 41 43 5064
100%22273335.6 42 44 49 54 72

Heat risk for exercise

Effective temperature in °C:Risk level
Less than 32 °CLow risk: Safe to exercise with proper hydration
32 °C to 41 °CModerate risk: Heat cramps or heat exhaustion likely
Above 41 °CHigh risk: Heat stroke likely.