Two sources of waves, call them A and B, send out waves across the surface of a lake. The waves from A have crests 1 cm high as measured from the normal undisturbed surface of the water. The waves from B are identical to those from A.
How far is the water displaced at a point where a crest from A crosses a valley from B?
A) 2 cm upward
B) zero
C) 1 cm upward
D) 1 cm downward
E) 2 cm downward
Question 2
You push your 2 kg physics book along a tabletop, pushing it with 10 newtons of force. If the book is greased so that friction is negligible, the book's acceleration is
A) zero.
B) 0.2 m/s2.
C) infinitely large.
D) 5 m/s2.
E) 20 m/s2.
Examples of structures in which extensive surface area is important for function.
Lake 226 at the Experimental Lakes Area divided in half.
The Sun as it appears from the surface of the Earth at sunrise.
Selected Minerals: Food Sources, Functions, and Deficiency and Toxicity Symptoms
Diversion of surface water
Pediatric Nomogram Used for Determining Body Surface Area