The entrance to a private car park is protected by a boom, which closes the entrance as shown in the figure below. The boom can be made to balance by fixing a counterweight W a short distance (0.5 m) from the pivot on the main support.
a) If the weight of the boom alone, F, is 400 N, and acts 3.0 m from the pivot as shown, calculate the counterweight required for the boom to be balanced.
b) If the actual counterweight fitted to this boom was 2350 N:
i) what additional downward force must be applied by the car park attendant to lift the boom
ii) what will be the normal reaction, N, at the end support when the boom is resting on it?
c) Calculate the reaction force at the pivot when the counterweight is 2350 N and the other end of the boom is supported.
d) If the boom is replaced with a strong one of weight 470 N and the 2350 N counterweight is to be used again, where should the counterweight be fixed to exactly balance the boom.

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

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /

You can find results and justify them? you can test your hypothesis