Physics 2020 Exam 2 Constants and Formulae
Useful Constants
k
e
=
8
.
99
×
10
9
N m
2
/C
2
c
=
3
.
00
×
10
8
m/s
μ
◦
=
4
π
×
10

7
T m/A
e
=
1
.
602
×
10

19
C
m
e
=
9
.
110
×
10

31
kg
m
p
=
1
.
672
×
10

27
kg
◦
=
8
.
85
×
10

12
C
2
/(N m
2
)
g
=
9
.
80 m/s
2
1 eV
=
1
.
602
×
10

19
J
1 T
=
10
4
G
1 km
=
10
3
m
1 hr
=
3600 s
1 day
=
8
.
64
×
10
4
s
1 yr
=
365.242 days
1 milli (m)
=
10

3
1 micro (
μ
)
=
10

6
Useful Formulae
C
(circle) = 2
πr
D
(circle) = 2
r
A
(circle) =
πr
2
=
πD
2
/
4
V
(sphere) =
4
3
πr
3
A
(sphere) = 4
πr
2
V
(rectangular box) =
L
·
W
·
H
sin
θ
= (opposite)/(hypotenuse)
r
2
=
x
2
+
y
2
cos
θ
= (adjacent)/(hypotenuse)
1 = cos
2
θ
+ sin
2
θ
tan
θ
= (opposite)/(hypotenuse)
tan
θ
= sin
θ/
cos
θ
v
2
=
v
2
◦
+ 2
a
(
x

x
◦
)
v
=
v
◦
+
a
(
t

t
◦
)
x
=
x
◦
+
v
◦
(
t

t
◦
) +
1
2
a
(
t

t
◦
)
2
R
=

R

=
R
2
x
+
R
2
y
R
x
=
R
cos
θ
R
y
=
R
sin
θ
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Useful Formulae (continued)
F
g
=
w
=
mg
W
= (
F
cos
θ
)
s
= Δ(KE)
KE
≡
1
2
mv
2
PE
g
=
mgy
KE
i
+ PE
i
= KE
f
+ PE
f
p
≡
mv
F
e
=
k
e

q
1

q
2

/r
2
12
E
=
F
e
/q
P
=
W/
Δ
t
=
I
Δ
V
=
I
2
R
= (Δ
V
)
2
/R
W
= ΔPE =
q
Δ
V
=
q E d
I
= Δ
Q/
Δ
t
R
= Δ
V/I
C
=
Q/
Δ
V
C
=
◦
A/d
U
=
Q
2
/
(2
C
) =
1
2
C
(Δ
V
)
2
=
1
2
Q
(Δ
V
)
V
=
k
e
q/r
R
eq
=
∑
R
i
(series)
1
/R
eq
=
∑
(1
/R
i
) (parallel)
I
1
=
I
2
=
I
i
=
I
(series resistors)
Δ
V
=
∑
Δ
V
i
(series resistors)
Δ
V
1
= Δ
V
2
= Δ
V
i
= Δ
V
(parallel)
I
=
∑
I
i
(parallel resistors)
Δ
V
=
E 
Ir
q
=
Q
1

e

t/RC
(charging)
τ
=
RC
q
=
Qe

t/RC
(discharging)
F
=
qvB
sin
θ
F
=
BI
sin
θ
r
=
mv/qB
B
=
μ
◦
I/
(2
πr
)
∑
B
Δ
=
μ
◦
I
Φ
B
=
BA
cos
θ
E
=

N
ΔΦ
B
/
Δ
t
=

L
Δ
I/
Δ
t
Δ
V
=
E
=
E
=
B v
L
=
μ
◦
N
2
A/
=
μ
◦
n
2
A
=
μ
◦
n
2
V
I
=
E
/R
= (
B v
)
/R
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 Fall '08
 Staff
 Physics, Magnetic Field, Constants and Formulae

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