An object will ______________ in a fluid if its average density is ______________ the density of the fluid
a. float; greater than
b. float; less than
c. sink; less than
d. sink; equal to
b
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When the inside of a refrigerator is cooled, does thermal energy flow from hot to cold, or is it from cold to hot? Does this happen spontaneously, or is outside assistance required?
A) From cold to hot. Since this is against the normal flow of thermal energy, outside assistance is required. B) Only the Shadow knows. C) From hot to cold. Since this is the normal way that thermal energy flows, no outside assistance is needed. D) From cold to hot. Since this is the normal way that thermal energy flows, no outside assistance is needed. E) From hot to cold. Since this is against the normal flow of thermal energy, outside assistance is required.
The process of boiling that occurs in water tends to _______.
a. have no effect on the water's temperature b. warm the water c. both warm and cool the water at the same time d. cool the water
The diffusion constant for oxygen through water is 
What is the time for an oxygen molecule to diffuse 1 cm?
a. 
b. 
c. 
d. 
e. 
Which planet has a temperature of 400 degrees Centigrade on the side facing the Sun and -180 degrees Centigrade on the side opposite the Sun?
A. Venus B. Mercury C. Jupiter D. Earth E. Mars