Post I is your initial conclusion based on the data obtained in your experiment. It should be written in complete sentences.

*Upload a picture of your experimental setup. The picture must include a piece of paper with your name and the date. (Instructions on how to do this is shown on the Lab Discussions page.) Not having the correct pictures will result in a zero grade.

*Post the Force-Mass graph from the Gravity Force Lab.

*Describe the relationship between mass and the force of gravity. Specifically, how does YOUR GRAPH support your description? NOTE: Be very careful about bringing the acceleration due to gravity into your discussion as your data is being taken on objects that are not accelerating!

*Write an equation for the line on the graph. Explain what this equation means. What is the physical meaning of the slope? What are the labels? What is significant about the y-intercept? Don't forget to change the "x" and "y" variables and to label your slope!

*Explain (using your equation) how you could determine the force of gravity acting on an object.

A real estate major collected information on some recent local home sales. The first 6 lines of the database appear below. The columns correspond to the house identification number, the community name, the ZIP code, the number of acres of the property, the year the house was built, the market value, and the size of the living area (in square feet).

For the real estate data of Exercise 1, do the data appear to have come from a designed survey or experiment? What concerns might you have about drawing conclusions from this data set?

2.1)

What is the speed of an electron that accelerates from rest starting close to the negative plate of a capacitor just before it hits the positive plate? The electric field between the plates is 300 V/m and the distance between the plates is 0.050 m.

2.2)

A charge of +2.00 nC is on the Y axis at the point (0, 2.00) m. A charge of -3.00 nC is on the X axis at the point (3.00, 0) m. Find the direction of the electric field at the Origin.

2.3)

The electric field at a point A has the components E_x = 3.00 V/m   and E_y = +2.50 V/m. Find the direction of the force acting on a charge -14.0 nC placed at the point A. Express your answer as an angle measured counterclockwise from the positive X axis.

2.4)

A charge of 3.00 nC is on the Y axis at the point (0, 2.00) m. A charge of -2.00 nC is on the X axis at the point (-3.00, 0) m. Find the magnitude of the electric field at the Origin.

the voltage for the electrochemical cell shown below was .450 V.

Pt(s)|Cd(NO₃)₂ (aq)(.0100M) || Cl^- (aq) | AgCl (s)| Ag(s)

The standard reduction potentials are

Cd²⁺+2e^---> Cd (s) E^o= -.402 V

AgCl+e^---> Ag(s) + Cl^-  E^o=.222V

Calcuate the concentration of Cl^- if the cell potential was determined to be 0.605 V

An electrochemical cell is composed of pure copper and pure lead electrodes immersed in solutions of their respective divalent ions. For a 0.7 M concentration of Cu²⁺, the lead electrode is oxidized yielding a cell potential of 0.520 V. Calculate the concentration of Pb²⁺ ions if the temperature is 25˚C. The standard potentials for Cu and Pb are +0.340 V and -0.126 V.

Please show your work!

A new machine is purchased by a business for $200,000. For tax reasons, we assume the machine will lose $40,000 in value each year. If t is the number of years since the machine was purchased, and if V (t) represents the value of the machine after t years, write an equation in the form V (t)=mt+b for the value of the machine. Determine the domain and range for the function V (t).

Use the following half-reactions to write three spontaneous reactions, and calculate E cell for each reaction:

a. Au⁺ (aq) + e^- ----> Au (s) E= 1.69 V

b. N₂O (g) + 2H⁺ (aq) + 2 e^- ----> N₂ (g) + H2O (l) E= 1.77 V

c. Cr³⁺ (aq) + 3e^- ---> Cr (s) E= -0.74 V