To be dimensionally consistent, velocity [L/T], acceleration 
and time [T] must be related as follows.
a. 
b. 
c. 
d. 
a.
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What is the special property of a semipermeable membrane that makes osmosis possible?
A) The pores in the membrane only allow water to pass through. B) Water only moves through the membrane in one direction. C) Only the ions travel through the membrane. D) Ions only move one way through the membrane. E) none of the above
The greater proportion of energy immediately converted to heat rather than light occurs in
A) a fluorescent lamp. B) an incandescent lamp. C) both of these D) neither of these
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin tropospheres only, with gas coming from evaporation and sublimation. B) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. C) They have only small amounts of gas, all of which is leftover from outgassing long ago. D) They have very thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.
A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is 1000 kg/m3
A) 10 N B) 30 N C) 40 N D) 70 N