1 Môt sô công thưc Vât lj 12. 05/04/12, 11:36 pm
Bui Danh Nam
Trung tá
Sau dax la 1 so ct co jck cko cac pan trong khj lam paj kjem tra.
-Nhung cong thuc co ban
w=can(k/m)=can(g/l)
T=2pi /w=2pi.can(m/k)=2pi.can(l/g)=1/f
-phuong trinh x,v,a
x=Acos(wt+¥)
v=-Awsin(wt+¥)
a=-Aw2sin(wt+¥)
v max=Aw
a max=Aw2
A2=x2+(v2/w2)
-nang luong
Wd=1/2mv2
Wt=1/2kx2
W=Wt+Wd=1/2mv2+1/2kx2=1/2kA2
khj Wt=nWd => ta co ct :
x=+-can[1/(n+1)]
CHUC CAC BAN THANH CONG!
-Nhung cong thuc co ban
w=can(k/m)=can(g/l)
T=2pi /w=2pi.can(m/k)=2pi.can(l/g)=1/f
-phuong trinh x,v,a
x=Acos(wt+¥)
v=-Awsin(wt+¥)
a=-Aw2sin(wt+¥)
v max=Aw
a max=Aw2
A2=x2+(v2/w2)
-nang luong
Wd=1/2mv2
Wt=1/2kx2
W=Wt+Wd=1/2mv2+1/2kx2=1/2kA2
khj Wt=nWd => ta co ct :
x=+-can[1/(n+1)]
CHUC CAC BAN THANH CONG!