Physics, 24.10.2019 16:43 ziar7176

Many physical properties, such as force and mass, cannot be measured directly. rather, some other physical property is measured and the desired physical property computed from the results. for example, a bathroom scale does not actually measure mass or \"weight,\" but rather the compression distance of a spring. the numerical values on the scale are calibrated from the compression distance using basic physics principles such as newton\'s second law. coefficients of friction cannot be measured directly. in this problem, we are going to learn how we can indirectly measure the coefficient of kinetic friction between two surfaces by directly measuring the expansion of a spring. consider a 2.12 kg block that is dragged by a spring on a (relatively) frictionless horizontal surface at constant velocity. suppose the block reaches a rough patch and the spring stretches by 3.25 cm. compute the coefficient of kinetic friction μ between the block and the rough patch if the spring has a force constant of 172.0 n/m.

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Answer from: acrooks86

u =0.269

Explanation:

To find the coefficient of friction we know the following formula

$F_{f} = uN$

Where

$F_{f}$ = Force of Friction

= Coefficient of Friction

= Normal Force

Thus we first find the Normal force (N). Remember that the Normal force is perpendicular to the surface, and is equal to the opposing component of Weight (W). Since the surface here is horizontal, then the Normal force will be equal to the Weight.

$N = mg\\ N = (2.12)(9.8)\\ N = 20.776 N$

Now we find the Force on the spring that caused the extension of 3.25cm or 0.0325m

$F_{f} = ke$

Where

$F_{f}$ = Force of Friction

= Force Constant

= extension

Hence

$F_{f} = ke\\ F_{f} = (172)(0.0325)\\ F_{f} =5.59N$

Now to find the coefficient of friction we use the first formula

$F_{f} = uN\\ 5.59 = u(20.776)\\ u =0.269$

Answer from: Quest

Acetic acid /əˈsiːtɪk/, systematically named ethanoic acid /ˌɛθəˈnoʊɪk/, is a colourless liquid organic compound with the chemical formula ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called glacial acetic acid. vinegar is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to polyvinyl acetate and cellulose acetate. it is classified as a weak acid since it only partially dissociates in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7 3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366 chemblchembl539 chemspider171 drugbankdb03166 echa infocard100.000.528ec number200-580-7e numbere260 (preservatives)gmelin reference1380iuphar/bps1058keggd00010 meshacetic+acidpubchem cid176rtecs numberaf1225000uniiq40q9n063p un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4) key: qtbsbxvteameqo-uhfffaoysa-n smilescc(o)=o

Answer from: Quest

It is either a proton or a neutron im almost positive. hope this .

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