psb1 164 ☈ Name:

04 May 2011

1. Section one measurement: If a bar of soap is floating in a liquid, then what must be true about the density of the soap relative to the density of the liquid?
2. Section two motion: The time versus distance xy scatter graph below shows the motion of three different marbles. The marbles are labeled A, B, and C. All three marbles start from a time of 0 seconds and a distance of 0 centimeters. The following questions use this graph.
   
   _____ Which marble is slowing down?
3. _____ Which marble is speeding up?
4. _____ Which marble is moving at a constant speed?
5. __________ What is the speed of marble A between five and nine seconds?
6. __________ What is the speed of marble B between four and eight seconds?
7. __________ What is the speed of marble C between five and eight seconds?
8. Section three accelerated motion: ____________________ If a ball falls for two times as long a duration of time, by what multiple will the distance be increased? Will the distance covered increase by two, three, four, or eight times the original distance?
9. Section four momentum: For marbles rolling into a line of marbles, what two rules do the marbles obey?
   
10. The velocity v at the bottom of a banana leaf ramp for a marble released from a height h is given by the formula: $v\propto \sqrt{h}$. If the marble is rolled from a height four times as high, by what factor does the velocity v increase?

11. Extension (cm)	Force (gmf)
    0	0
    3	15
    6	30
    9	45

    Section five force: _______ Data was gathered for the extension of an elastic band using a cup and marbles to generate the force. The data in the table is from the experiment. Is the elastic band a linear elastic material?
12. _______________ For the data above, determine Hooke's constant for the elastic band using Hooke's law [ F = −kx ].
13. _______________ Trustingleen is a 26 kg RipStik rider. In the photo a physical science instructor has convinced Trustingleen to ride a RipStik down a sloping sidewalk with an abrupt end. The plan is for the instructor to catch Trustingleen and let the board crash off the end of the sidewalk. For this to work the instructor will have to bring Trustingleen from a speed of 3 m/s to 0 m/s in 0.3 seconds. How much force will the instructor have to exert to bring Trustingleen to a safe stop?
14. Section six heat: ΔT = ____________________ °C What is the change in temperature ΔT for metal which contained the most heat energy?
15. ___________________ Which material holds the most heat?
16. Section seven earth coordinates:____________________ A student walked north on a line of longitude starting at N 6° 54.467' and ending at N 6° 54.567'. The student measured a distance of 192 meters. Determine the number of meters per minute of latitude based on this data.
17. Section eight weather: __________________ What type of cloud is shown in the image?
18. I wake the babes from their midnight dreams, I shake the ground and rattle the beams, Before me comes a bright blue flash, While all around me the rains lash. I roll across hill and dale, I reflect off of rill and vale, The spawn of Bergeron, With a crack, bang, or rumble, I bring the fear on. What am I? __________________
19. Section nine waves: A RipStik was ridden across a wet cloth towel soaked in water with food color. The RipStik was then swizzled across a large sheet of presentation paper. The swizzle wave can be seen in the diagram below.
    
    
    λ = _______________ Determine the wavelength λ of the RipStik swizzle wave.
20. a = _______________ Determine the amplitude a of the RipStik swizzle wave.
21. τ = _______________ The RipStik took a duration of 1.36 seconds to travel the 68 centimeters seen on the diagram above. Calculate the period τ for the RipStik swizzle wave.
22. f = _______________ Calculate the RipStik swizzle wave frequency f.
23. ѵ_wave = _______________ Use the wavelength λ and frequency f to calculate the velocity ѵ_wave of the RipStik swizzle wave.
24. _______________ Given a speed of sound of 350 m/s and an echoing surface 100 meters away, how long a duration in seconds would you expect for a sound to travel out and echo back to you?
25. Section ten spectra: Orange and brown are the same hue. Both orange and brown have a hue angle of 30° What characteristics of light make these two colors different?
26. Section twelve electricity: current i = ____________ In my kitchen a 780 Watt toaster, a 300 Watt rice cooker, and a 1250 Watt microwave oven are all connected to a single 120 Volt outlet. If all three are turned on, calculate the current i used by all three together.
27. __________ An outlet can safely deliver 18 Amps. Can I safely run all three appliances in the above question at the same time?
28. Section eleven optics: The data provided below is the apparent depth of the image of a penny under sheets of glass versus the actual depth of the penny. Plot the data on the graph.
    
29. ________________ Calculate the slope of the linear best fit line. The slope is the index of refraction for glass.
30. Section thirteen chemistry: A purple flower was boiled in water. The water turned purple. Based on the general rules for color change discovered in that laboratory, determine from the color changes listed below whether the following unknowns are likely to be an acid or a base. Put your answers in the blanks below the unknown.

    substance	color change	acid or base?
    cream of tartar	bright pink
    sodium hydroxide (lye)	dark blue green
    potassium chloride	purple

31. Section fifteen site swap notation:
    The mathematical equation 4 + 5 = 9 is to the site swap equation 334233
    as
    the mathematical equation 3 + 5 = 10 is to the site swap equation 252525
    Explain why.