a0:20
a(rad):0.349
tan ∝:0.364
cos ∝:0.94
s:0.6
n1: t=1.014;a=1.167; μt=0.237;Δμt=0.004
n2: t=1.02;a=1.153; μt=0.239;Δμt=0.002
n3: t=1.043;a=1.103; μt=0.244;Δμt=0.003
n4: t=1.038;a=1.114; μt=0.243;Δμt=0.002
n1: t=1.044;a=1.101; μt=0.241;Δμt=0.003
n1: t=1.032;a=1.128; μt=0.241;Δμt=0.003
Giá trị trung bình: t= 1.032; a=1.128 ;μt=0.241;Δμt=0.003
b)0.241±0.003