What scientist discovered more elements than any other person?

a. Lavoisier
b. Boyle
c. Berzelius
d. Davy


d

Physics & Space Science

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Molecular Speeds: The molecular weight of nitrogen, N2, is 28 g/mol. What is the rms speed of nitrogen molecules in a cooler at 8.0°C? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol.

A. 450 m/s B. 500 m/s C. 550 m/s D. 600 m/s E. 650 m/s

Physics & Space Science

What is the direction of the electric field vector at point P in the situation shown below? (Assume that the balls are actually point particles equidistant from P.)



A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD

Physics & Space Science

Cubic zirconia stabilized with CaO is used as an oxygen sensor material because of the high electrical conductivity resulting from the fast diffusion of oxygen ions.

Physics & Space Science

Consider the displacement vectors shown below.



a) Which vector (if any) is equal to ?
(b) Which is not equal to but has the same magnitude?
(c) Which is equal to ?
(d) Which is equal to ?

Physics & Space Science