Imagine you are holding a long rope under tension attached to a distant support. You can generate periodic waves by shaking the end up and down. Changing which of the following will least affect the velocity of waves along the string?
A. Tension
B. Frequency
C. Mass per unit length of rope
D. None of these choices affect the wave speed
Answer: B
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Star formation ceased first in the
A) nucleus. B) spiral arms. C) bulge. D) halo. E) Galactic disk.
Some features on Mars attributed to flooding may have been caused by temporary heating events like
A) impacts B) volcanic eruptions C) lightning D) Both A and B
A packing crate rests on a horizontal surface. It is acted on by three horizontal forces: 600 N to the left, 200 N to the right, and friction. The weight of the crate is 400 N
If the 600-N force is removed, the resultant force acting on the crate is A) zero. B) 200 N to the right. C) 200 N to the left. D) 400 N to the left. E) impossible to determine from the information given.
An amino acid is an organic molecule that contains both an amine group and a carboxyl group. At neutral pH, which structure is most likely:
A) structure (a) B) structure (b) C) neither structure D) both structures