Density of wooden object 1. weigh the wooden object and record its mass mwood in table 11.2. then place the balance on the ring stand. 2. attach a metal sinker to the bottom of the wooden object (the sinker should weigh enough to submerge the object completely) and hang the combination from the balance hook. think about why you do not need to weigh the sinker! 3. place enough water in the large beaker so that the wooden object and sinker can be submerged completely without the sinker touching bottom. place the beaker on the lab jack. 4. raise the lab jack to submerge only the sinker, then measure and record the mass m, of the object/sinker combination. 5. raise the lab jack to submerge the entire object/sinker combination, then measure and record their combined mass mso- 6. use equation 11.2 to calculate and record the buoyant force fo (in newtons). 7. use equation 11.6 to calculate the density pwood of the wooden object. use the accepted value of the wood density (consult your textbook for this value) to calculate the percent error. b. density of wooden object table 11.2 mwood =0.012 kg mo = 0.072 kg mso = 0.055 kg fo=10.284 n prood = 4222.6 kg/m^3 ipted pwood = 420 kg/m^3

Question 1 what is amperage? is the rate of doing work. is the rate of flow of protons in electric current. represents the amount of pressure behind electron flow. is the rate of flow of electrons in electric current. 2 points question 2 what is voltage? is the rate of doing power. represents the amount of pressure behind electron flow. is the rate of doing work. is the rate of flow of electrons in electric current. 2 points question 3 what is power? is the rate of flow of protons in electric current. is the rate of flow of electrons in electric current. is the rate of doing work. represents the amount of pressure behind electron flow. 2 points question 4 if we multiply volts times amps we get what? power circuit work current 2 points question 5 what are two ways alternating currents are similiar? in both ac and dc electrons flow in the same pattern. in both ac and dc, the flow of electrons changes directions back and forth. both ac and dc are only possible in certain materials with atoms that will allow electron flow. both ac and dc involve the flow of electrons. 4 points question 6 how does the flow of electrons flow in an alternating current? the flow of electrons is always slower in an alternating current than within a direct current. the flow of electrons is not constant and forward; it changes direction back and forth. electrons flow from from a higher affinity to that of a lower affinity. electron flow is constant and only in a forward direction. 2 points question 7 what is the flow like in a direct current? the flow of electrons is not constant and forward; it changes direction back and forth. the flow of electrons is constant and only in a forward direction. the flow of electrons go from a higher affinity to a lower affinity. the flow of electrons are always faster in a direct current. 2 points question 8 how is an electric current able to flow? electrons flow from the higher affinity to lower affinity and electrical current is generated. protons flow from the higher affinity to lower affinity and electrical current is generated. the movement of protons from one atom to another leads to an electric charge. the movement of electrons from one atom to another atom in a line results in a flow of electric current. 2 points question 9 how do electrons move from the two different types of metal in a battery? protons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated. protons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.

Elements in group viiia (also known as group 18, or the noble gases) have similar properties because they all have a. the same number of electron shells b. full octets c. the same number of valence electrons d. the same number of electrons needed to fill their octet

The focal length of a lens is determined by the curve of the lens and the material that the lens is made from. (5 points) is this true or false? ?