Physics 1401

Question 1. What strengthens a load-carrying arch?

(a) Tension

(b) Compression

(c) Shear

(d) Sturm and Drang

(e) Nike air pockets

 

 

Question 2. Two shapes for an arched dam to hold back a lake are shown below. Based on your previous answer, which design is better? (Hint: check out Hoover Dam.)

(a) a

(b) b

 

 

Question 3. When the size of a cube is scaled up by a factor of 2, the area of the cube increases by

(a) 0

(b) 2

(c) 4

(d) 6

(e) 8

 

 

Question 4. For the cube in the previous question, the volume of the cube increases by

(a) 0

(b) 2

(c) 4

(d) 6

(e) 8

 

 

Question 5. Does the ratio of surface area to volume increase, decrease, or stay the same as things are scaled up?

(a) increase

(b) decrease

(c) stay the same

 

 

Question 6. Does the correct answer to the previous question help explain why elephants have extra-large ears?

(a) yes

(b) no

(c) what?

   

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