An experiment is performed to determine the force constant k of a spring by measuring its length as a function of the applied load. The following data are obtained: Mass (g) Length (cm) Mass (g) Length (cm) 10.0 5.1 110.0 36.57 20.0 8.8 120.0 38.57 30.0 10.9 130.0 43.55 40.0 14.3 140.0 46.88 50.0 18.0 150.0 49.01 60.0 20.56 160.0 52.20 70.0 23.94 170.0 54.19 80.0 26.94 180.0 58.52 90.0 30.92 190.0 61.84 100.0 33.91 200.0 64.50
Report the values of L0 (initial length) and k (force constant) and their associated uncertainties with 95% confidence limit.

A and B react according to the scheme 2A ±B oC . The reaction is highly exergonic, that is, it goes to completion when A and B are allowed to react. 2.000 tons of A and 1.00 ton of B were mixed in a kettle. A balance, the maximum capacity of which is 0.500 tons with 1% precision was used to weigh A and B. Assume that the molar masses of all chemical species are equal. What is the maximum possible amount of unreacted reactants? 2)An experiment is performed to determine the force constant k of a spring by measuring its length as a function of the applied load. The following data are obtained:

Explanation:

carbon is found in all living things. carbon atoms move constantly through

living organisms, the oceans, the atmosphere, and the earth’s crust in what is

known as the carbon cycle. the directions taken by carbon atoms through this

cycle are very complicated and can take millions of years to make a full circle.

all animals, from humans to the dinosaurs are part of the carbon cycle. when

animals eat food, they get carbon in the form of carbohydrates and proteins.

in animals, oxygen combines with food in the cells to produce energy for daily

activity and then gives off carbon. the carbon combines with oxygen to form

carbon dioxide (co2) and is released back into the atmosphere as a waste

product when animals breathe and exhale.

from 145-65 million years ago, earth was much

hotter than today and covered with dense,

tropical swamp forests. the trees and other

plants were immense and

provided an endless supply of

food for the giant animals that

roamed the land. somewhere in

the air above one of these

forests, a lone carbon atom has joined

up with two oxygen atoms to form a molecule of co2.

the co2 molecule was sucked into the tiny holes (stomata) on the leaf of a

fern plant and joined with sunlight, chlorophyll and water to make food and

energy in the plant’s cells through photosynthesis. the oxygen (o2) from the

co2 molecule was sent back into the atmosphere; the carbon atom (c) was

detached and used to make a molecule of sugar.

if that carbon atom had been eaten instead, a totally

different situation would have developed. let’s say

that a giant plant-eating dinosaur (herbivore) ate the

fern for breakfast, and swallowed the carbon in the

fern in the form of carbohydrates and proteins. in

the process of respiration, oxygen combined with

the carbohydrates and proteins in the dinosaur’s cells

to provide energy for its daily activity.  

the answer to this is proletariats.

hope this : )