Kinesiology 3341A/B Lecture 7: 3341 Chapter 6

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graytortoise911

13 Dec 2019

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Chapter 6 biomechanics: torque and centre of mass. Centre of mass is the centre of the body, which is made up of an in nite number of particles. Balance method: a way to measure where the centre of mass is when a mass is balanced on a pivot, the centre of mass is somewhere along the line (of where the mass and the pivot is touching) If a mass has 3 particles, the centre of mass is somewhere in the middle of the triangle. When a person picks something up off the ground, the weight of that object has an impact of where the centre of mass is need to also consider centre of pressure. A moment (bend) is created when a force (f) is applied at a distance (d) from the centre of rotation of an object. Moment arm: the perpendicular distance between the line of action of the force and the centre of rotation.

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A lunch tray is being held in one hand, as the figure illustrates (I will explain). The mass of the tray itself is 0.214 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.20 kg plate of food and a 0.239 kg cup of coffee. Obtain (a) the force T exerted by the thumb and (b) the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground. The person's right hand is shown with the thumb on top and all other fingers on the bottom or the tray. A vertical line is drawn as where ALL the measurements are made to (with arrows pointing out to it) from the base of the thumb upward. The following values are labeled: from this line to horizontal distance over to the thumbnail = 0.0600m, from this line to index fingernail = 0.100m, from this line over to middle of plate = 0.240m, from this line over to middle of coffee cup = 0.380m, and from this line over to the other line way to the right which is at the right edge of the coffee cup AND end of tray = 0.400m. The force F is labeled pointing up from the index finger (and all other fingers are hiding behind it). The force T is labeled pointing down from the thumb.

Hi, I have a lab and have provided the information below and the data calculated at the end. Please help in prelab questions and postlab questions. WIll rate really good if it's correct. Thanks a lot.

DATA (The total liquid should be 50ml, not more than that)

SNO.	NACLO (intial temperature)	THE (B) Liquid temperature	NaClo(g)	The B solution(g)	FINAL temperature(together)
1	21.7	21.5	10ml	40ml	30.4
2	none	21.5	0ml	50ml	21.5
3	21.8	none	50ml	0ml	21.8
4	21.9	21.7	20ml	30ml	38.4
5	21.9	21.7	30ml	20ml	37.4
6	22.0	21.7	40ml	10ml	28.8
7	22.1	21.9	25ml	25ml	42.2

Mole ratio lab v3b Rukes APChemistry Determination of the mole ratio of a chemical reaction The method of continuous variations is a means of determining the stoichiometric mole ratio of the reactants in a chemical reaction. The stoichiometric ratio, as given by the coelficients in the balanced chemical equation, represents the ratio at which chemicals must be combined to produce al product with no excess rcactant. Sincc there is no âwasted" reactant, the maximum amount of product is made for the given amount of both reactants. In themethod of continuous variations, several trials are performed. In each trial, there is a fixed amount of total reactant (measured by moles or volume or mass, etc.), but with the two reactants mixed together in different ratios. Some measure of the amount of product is made for each trial (volumc of gas produccd, mass of precipitate, color of product solution, etc.). When the amount of product is maximized, the stoichiometric ratio has been used. A similar technique fixes the amount of one reactant and increases the other until the maximum amount of product is reached In this lab the two chemicals being mixed are solutions of known molarity. The total volume of solutions is kept constant over several trials. The chemicals will release heat when mixed together and raise the temperature of the mixture. Since the volume of the solutions mixed is held constant, the temperaturc changc recorded wl be proportional to the amount of heat produced and therefore also the "anount of reaction" that occurred. Objectives - To graphically determine the stoichiometric mole ratio of a reaction. CAUTIONS: All solutions are basic and can be harmful to skin and eyes. Sodium hypochlorite can also bleaclh clothing. Wear goggles, gloves and aprons. ï¸µ Pre-lab: complete on a separate sheet. 1. Accurately graph the following data gathered from an experiment which mixes 0.5 M solutions of AgNO3 and K2CrO4. The x-axis should plot the volume of AgNO3 reading Irom lef to right (or the volume of K2CrO4 reading from right to left.) Draw two best fit lincs, one for the "up" slope and one for the "down" slope... see example to the right of the data. (Also consult your graphing skills handout if you have not yet drawn a graph) trial mL AgNO3 mL K2CrO mass of precipitate (g) 45 35 25 20 15 10 shape of graph 15 25 30 35 40 45 5.0 4 10.0 9.9 6.6 3.3 a) Use the intersection of best fit lines to find the theoretical maximum amount of product. b) Use the x-values to find the stoichiometric volume ratio c) Use the answer from b) and given molarities to find the stoichiornetric mole ratio d) How many values were used to plot your "up" line? How many values were used to plot your "down" line? 2. What single temperature change should be recorded if 10 mL of solution A at 20Â°C is mixed with 10 mL of 3. What single temperature change should be recorded if 10 mL of solution A at 20Â°C is mixed with 30 mL of 4. List four dependent variables that are often used for the method of continuous variations. Are these enough values to plot a good line? solution B at 24.0Â°C and the final temperature reaches 28.0Â°C? solution B at 24.0Â°C and the final temperature reaches 28.0Â°C?

Kinesiology 3341A/B Lecture 7: 3341 Chapter 6

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