Awindow washer pulls herself upward using the bucket-pulley apparatus. the mass of the person plus the bucket is 65 kg.
(a) how hard must she pull downward to raise herself slowly at constant speed?
(b) if she increases this force by 10%, what will her acceleration be?

A)
To go up at constant velocity, the net force on her should be 0. The force upwards must equal the total weight.
W = mg
= 9.81 x 65
= 637.65 N
Therefore, she must exert a force of 637.65 N to move upwards at constant velocity

b) Net force = 1.1F - W(1.1 represents 10% increase)
We know from the previous part that F = W
1.1W - W
= 0.1W
Net force = 63.8 N
Using Newton's second law of motion:
F = ma
a = F/m
a = 63.8/65
= 0.98 m/s²

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