Activity In this activity we'll use a simulation to observe how the mass on a spring affects its resting equilibrium point and also ha
oscillation.
Question 1
To begin your investigation, open this simulation: Masses and Springs e
Part A
First, let's Investigate the relationship between extension and force. In this case, the force is supplied by a mass under the
• Set the friction slider to "lots," to help damp out spring oscillations and make it easier to judge resting positions.
Using spring 1 and the ruler, observe the equilibrium position with no mass attached. Measure to the bottom horiz
spring. Record in the data table below.
Carefully add each mass in turn: 50 grams, 100 grams, and 250 grams and recording the spring's resting position in
measure to the bottom horizontal section of the spring.
Finally, for each of these masses, record the extension x: the displacement between the equilibrium point without a
equilibrium point with the mass attached. (You'll have to do a subtraction.)

Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6ä±c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ä±c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ä±c) x1 y1 t ( ä±c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000

Chemical energy is a form of a. kinetic energy only. b. both potential and kinetic energy. c. neither potential nor kinetic energy. d. potential energy only. reset

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?