1.A particular equation is given by 2b = cd2.If the dimensio

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1.A particular equation is given by 2b = cd2.If the dimensions of b are that of length [L] and the dimensions of d are that of time [T],what are the dimensions of
a.2[L]/[T]2
b.[L]/[T]2
c.[L][T]2
d.2[L][T]
2.The area of a sheet is 8 m2.What is its area in cm2?
a.8 x 10 2 cm 2
b.8 x 10 -2 cm 2
c.8 x 10 4 cm 2
d.8 x 10 -4 cm 2
3.A particle that has non-zero velocity
a.can have zero acceleration
b.can never have zero acceleration
c.definitely has zero acceleration
d.definitely has non-zero acceleration
4.A car starts from rest and accelerates at 12 m/s2.How much distance does it cover in 2 seconds?
a.26 m
b.12 m
c.24 m
d.48 m
5.A vector A has a magnitude of 6.0 m and points in a direction 40.0º South of West.A second vector,B,has a magnitude of 1.5 m and points in a direction 75.0º North of West.Using the component method of vector addition,find the magnitude of the resultant of vectors A and B.Round your answer to three significant figures.
Answer:

1、a； 2、a；3、a；4、c；5、5.6m and points in a direction 25.4º South of West
第5题需慎重,最好演算下

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