In the following multiple-choice problems, circle the one answer which best completes the Sentence (i) (ii) The glass transition temperature of polystyrene is about 110 °C. Relative to a sample at 120 °C, at room temperature polystyrene is: a orders of magnitude more viscous b. slightly more viscous c. equally as viscous d. less viscous e. none of the above. The glass transition temperature of polystyrene is about 110 °C. Relative to a sample at 120 °C, a sample of polystyrene at 130 °C is: orders of magnitude more viscous

Question 1: Sally's pet lizard makes a weird groaning noise every couple of seconds. She notices that the number of groans per minute is very regular, but increases as the temperature increases. Further observations reveal that the number of groans per minute actually has a linear relationship with temperature over the normal range of temperatures in the lizard's natural environment. So she decides to make use of her lizard as a thermometer. Sally measures that the number of groans per minute at 10.0°C is 12, and the number of groans per minute at 45.0°C is 31. If she measures that the number of groans per minute in the lizard's usual aquarium is 24, what is the temperature in the aquarium, in degrees Celcius? You can check your answer using the Mastering Physics assignment. Math tip: A linear relationship between two quantities X and Y, means that for a change in X (which we usually call AX), the change in Y is given by AY = m AX, where m is some constant. In the range of X where this…

You have the six pieces of metal listed below plus a beaker of water containing 400. g of water. The water temperature is 21.0 °C. Metals Specific Heat (J/g. K) Mass (g) 1. Al 0.9002 100. 2. Al 3. Au 4. Au 5. Zn 6. Zn 0.9002 0.1289 0.1289 0.3860 0.3860 50. 100. 50. 100. 50. The specific heat capacity of water is 4.184 J/g °C.

Kerosene has an API gravity of 42.5. What is the specific gravity of kerosene at 16°C? How does this compare with the value in Table 2.7? What is the energy density (MJ/L) of kerosene at 16°C? Use the data given in Table 2.7.

A child takes a helium balloon on a plane from Denver (with an air pressure of 0.83 atm) on a cool day when the temperature is 20.0oC to Boston (at sea level, with an air pressure of 1.0 atm) where the temperature is 5.0oC.  Assume that no gas escapes from the balloon during the flight.  What is the volume of the balloon in Boston, relative to its size in Denver? Group of answer choices The volume in Boston is 0.79 times the volume in Denver. The volume in Boston is 0.20 times the volume in Denver. The volume in Boston is 0.87 times the volume in Denver The volume in Boston is 1.3 times the volume in Denver. The volume in Boston is the same as the volume in Denver.

Summarize how at least two reference materials relate to the basic scientific principles of flying a paper plane. Each reference material must come from a different source. Be sure to describe how the references provide a foundational background for the experiment.

1. Suppose identical solid spheres are distributed through space in such a way that their centers are lie on the points of a lattice, and spheres on neighboring points just touch without overlapping. (Such an arrangement of spheres is called a close-packing arrangement.) Assuming that the spheres have unit density, show that the density of a set of close-packed spheres on each of the four structures (the "packing fraction") is: fcc: bcc: √√2/6=0.74 √√3/8=0.68 SC: π/6=0.52 √√3/16=0.34 diamond:

The graph below shows the pressure and volume for a sample of dry air carried out at two different constant temperatures. Volume (x 10-³ m ³) 2.5 N 1.5 1 0.5 0 50 M 100 150 Pressure (k Pa) 200 250 -T= 300 K -T200 K An isothermal change has to be carried out very slowly. Explain why this is the case. Use data from the graph and the ideal gas equation to calculate the number of moles of gas in the sample.