Question

29
Which of these is used as a solvent for dry cleaning?
(1 Point)
Bitumen
Paraffin wax
Petrol
Kerosene

Answer 1

ᕼᗴᖇᗴ'Տ YOᑌᖇ ᗩᑎՏᗯᗴᖇ.

ᴏᴘᴛɪᴏɴ (ᴄ) ᴘᴇᴛʀᴏʟ

ʜᴏᴘᴇ ɪᴛ's ʜᴇʟᴘ ᴜʜ

ᴍᴀʀᴋ ᴍʏ ᴀɴsᴡᴇʀ ᴀs ʙʀᴀɪɴʟɪsᴛ

Answer 2

$∴WorkDonebyforceapplied=200J∴WorkDonebyfrictionalforce=−50J∴WorkDonebyfrictionalforce=−50J∴WorkDonebyweightofbox=0J∴WorkDonebyweightofbox=0JStep−by−stepexplanation:Step−by−stepexplanation:Given:Given::⟹Massofbox(m)=10kg:⟹Massofbox(m)=10kg:⟹Appliedforce(F)=100N:⟹Appliedforce(F)=100N:⟹Frictionforce(fr)=25N:⟹Frictionforce(fr)=25N:⟹Displacement(s)=2m:⟹Displacement(s)=2mToFind:ToFind::⟹WorkDonebyappliedforce(wF)=?:⟹WorkDonebyappliedforce(wF)=?:⟹WorkDonebyfrictionalforce(wfr)=?:⟹WorkDonebyfrictionalforce(wfr)=?:⟹WorkDonebyweightofbox(wm)=?:⟹WorkDonebyweightofbox(wm)=?•Accordingtogivenquestion:AsweknowthatAsweknowthat:⟹Workdone=Forceapplied×Displacement:⟹Workdone=Forceapplied×Displacement:⟹wF=100×2:⟹wF=100×2:⟹wF=200joule:⟹wF=200jouleAgain:Again::⟹wfr=fscosθ:⟹wfr=fscosθ:⟹wfr=25×2×cos180°:⟹wfr=25×2×cos180°:⟹wfr=−50joule:⟹wfr=−50joule∘Weightofbox=mg=100N∘Weightofbox=mg=100N∘Anglebetweenforceanddisplacement=90°∘Anglebetweenforceanddisplacement=90°Similarly:Similarly::⟹wm=fscosθ:⟹wm=fscosθ:⟹wm=100×2×cos90°:⟹wm=100×2×cos90°:⟹wm=100×2×0:⟹wm=100×2×0:⟹wm=0joule:⟹wm=0joule</p><p>$