Question

几道物理题帮忙解决一下

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 c?

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:

Answer 1

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

Answer 2

英文的看不懂啊