Answer to Question #203937 in Physics for Rethabile

Question

3. A typical E.coli bacteria is about 5 microns (or micrometers) in length. How long is this length in millimeter? (3)

A) 5.000 mm C) 0.005 mm E) 50 mm

B) 5000 mm D) 0.05 mm

4. Which one of the following equations are dimensionally consistent? (3)

A) v = at2 C) v =  

B) v = at2 D) v2 = 2ax

5. How many significant figures does the number 0.000054 have? (2)

A) 4 C) 5

B) 6 D) 2

6. How many significant figures does the number 3.001 x 105 have? (2)

A) 4 C) 7

B) 10 D) 2

Answer 1

3. 5 microns is $5\times 10^{-6}m = 5\times 10^{-3}mm = 0.005mm$. Thus, the answer is C.

4. If a denotes the acceleration, then A and B are consistent.

5. Ignoring all zeros at the beginning, obtain two significant figures (5 and 4). Thus, the answer is D.

6. A.