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Physics 299
Important Constants and Equations
Note:
Some basic simple equations you are supposed to
know.
Here we are providing you with only some important
equations that were introduced in the chapters given below.
Constants:
g = 9.80 m/s
mass of electron = 9.11 x 10
31
Kg
mass of proton
= 1.67 x 10
27
Kg
μ
o
= 4π x10
7
T.m / A
k = 9 x 10
9
N . m
2
/ C
2
ε
o
= 8.85 x 10
12
C
2
/ N.m
2
;
k
= 1/ (4π
ε
o
)
e = 1.60x 10
19
 C; charge on electron or proton
h = 6.63 x 10
34
J.s;
Planck’s constant
1 eV = 1.60x 10
19
J
Physics 298 information
Roots: x = (b
±
√
(b
2
– 4 a c)) / (2 a)
1.
A
x
= A cos α;
A
y
= A sin α
2.
α
= tan
1
(A
y
/ A
x
)
3.
A =
√
(A
x
2
+ A
y
2
)
Other important equations:
4.
∆
x = (v
o
+ v) t/2
5.
v = v
o
+ a t
6.
∆
x = v
o
t + ½ a t
2
7.
v
2
= v
o
2
+ 2 a
∆
x
8.
K = ½ mv
2
9.
w = F d cos
ϑ
10. U = mgh
11.
p = mv
12.
v = r ω
14.
F
c
= mv
2
/ r; centripetal force
Chapter 20 Electric Charge, Force, and Field
F = k q
1
q
2
 / r
2
;
Coulomb’s Law
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This note was uploaded on 06/03/2010 for the course PHYS 299 taught by Professor Hoston,amahd,bakanowski during the Summer '08 term at University of Louisville.
 Summer '08
 Hoston,Amahd,Bakanowski
 Physics

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