Giải dùm với, ngắn gọn thôi nha

Đáp án:

Giải thích các bước giải:

a)s=s1+s2+s3+s4+s5/5=200+199+199+201+202/5=200

Δs1=s-s1=200-200=0cm

Δs2=s-s2=200-199=1cm

Δs3=s-s3=200-199=1cm

Δs4=s-s4=200-201=-1cm

Δs5=s-s5=200-202=-2cm

Δs=Δs1+Δs2+Δs3+Δs4+Δs5/5=1+1-1-2/5=0,2cm

b)sai số dụng cụ 

Δsdc=1/2dcnn=1/2.1=1/2cm

Δs=Δs+Δsdc=0,2+0,5=0,7cm

c)t=t1+t2+t3+t4+t5/5=1,002+1,003+1,001+1,002+1,001/5=1,002s

Δt1=t-t1=1,002-1,002=0s

Δt2=t-t2=1,002-1,003=-1.10^-3s

Δt3=t-t3=1,002-1,001=1.10^-3ss

Δt4=t-t4=1,002-1,002=0s

Δt5=t-t5=1,002-1,001=1.10^-3s

Δt=Δt1+Δt2+Δt3+Δt4+Δt5/5=-1.10^-3+1.10^-3+1.10^-3/5=2.10^-4s

d)sai số dụng cụ 

Δtdc=1/2dcnn=1/2.0,001=5.10^-4s

sai số Δt=Δt+Δtdc=2.10^-4+5.10^-4=7.10^-4s

e) dựa v=s/t

v1=s1/t1=200/1,002=199,600cm/s

v2=s2/t2=199/1,003=198,404cm/s

v3=s3/t3=199/1,001=198,801cm/s

v4=s4/t4=201/1,002=200,599cm/s

v5=s5/t5=202/1,001=201,798cm/s

v=v1+v2+v3+v4+v5/5=199,600+198,404+198,801+200,599+201,798/5=199,840cm/s

f)Δv=v(Δs/s+Δt/t)=199,840.(0,2/200+2.10^-4/1,002)=0,239cm/s

e)v=v±Δv=199,840±0,239cm/s