Which of the following is not a vector quantity?
a. temperature
b. velocity
c. acceleration
d. displacement
a
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The mass density of normal air is, at 
and the average molecular mass of air is 29.0 u. If the mean free path of an air molecule at room temperature is measured to be 111 nm, what is the average diameter of an air molecule.
A. 0.31nm B. 0.26nm C. 0.28nm D. 0.49nm E. 0.56nm F. 0.23nm
Describe how conditions on Venus have produced a runaway greenhouse effect
What will be an ideal response?
Uranium-238 decays to Thorium-234 by emitting which of the following?
a. gamma ray c. beta particle b. positron d. alpha particle
Two point charges of + 20.0 ?C and - 8.00 ?C are separated by a distance of 20.0 cm. What is the intensity of electric field E midway between these two charges?
A) 25.2 × 106 N/C directed towards the negative charge B) 25.2 × 106 N/C directed towards the positive charge C) 25.2 × 105 N/C directed towards the negative charge D) 25.2 × 105 N/C directed towards the positive charge E) 25.2 × 104 N/C directed towards the negative charge