A hospital patient confined to bed will be less likely to develop bed sores with a
A) firm mattress.
B) soft mattress.
C) water bed.
D) none of these will help.
Answer: C
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A pulse is described by 
in SI units. What is the velocity of the pulse?
A. 3 m/s in the +x direction B. 2 m/s in the ?x direction C. 2 m/s in the +x direction D. 4 m/s in the ?x direction E. 4 m/s in the +x direction
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Fill in the blank(s) with the appropriate word(s).
As water drops fall at a steady rate from a leaking faucet they
A) get closer together. B) get farther apart. C) remain at a relatively fixed distance from one another.