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Champ Jee
Subject: Physics
, asked on 28/4/18
Q20.
Explain in easy language because I haven't studied this topic.
Q.20. Quito, a city in Ecuador and Kampala, a city situated in Uganda both lie on the Equator. The longitude of Quito is 82
°
30' W and that of Kampala is 37
°
30' E. What is the distance from Quito to Kampala.
(a) along the shortest surface path
(b) along a direct (through-the-Earth) path? (The radius of the Earth is 6.4
×
10
5
m)
Answer
1
Champ Jee
Subject: Physics
, asked on 12/4/18
What are the dimensions of permittivity and permeability in SI units? I need them for solving a problem, please.
Answer
1
Champ Jee
Subject: Physics
, asked on 11/4/18
S
h
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)
&
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=
6
.
67
×
10
-
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-
m
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k
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I
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s
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?
(
A
)
1
n
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t
w
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n
=
6
.
67
x
10
-
11
n
e
w
t
o
n
(
B
)
1
n
e
w
t
o
n
=
6
.
67
x
10
—
17
n
o
t
w
e
n
(
C
)
1
n
o
t
w
e
n
=
6
.
67
x
10
-
17
n
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w
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(
D
)
I
n
e
w
t
o
n
=
6
.
67
x
10
-
12
n
o
t
w
e
n
Answer
1
Champ Jee
Subject: Physics
, asked on 11/4/18
Box : how that converted? Simplify please.
Two vectors having equal magnitudes A make an angle
θ
with each other. Find the magnitude and direction of
the resultant.
Solution : The magnitude of the resultant will be
B
=
A
2
+
A
2
+
2
A
A
cos
θ
=
2
A
2
(
1
+
cos
θ
)
=
4
A
2
cos
2
θ
2
=
2
A
cos
θ
2
Answer
2
Champ Jee
Subject: Physics
, asked on 10/4/18
I have got the answer but I assumed x to be of dimension length.
What does x-coordinate(what is it) have to do here? Why should we take any dimensions of it? Please explain and no links. Thank you!
[Ans : L^-1 , ML^2T^-2] by the way.
Q.1. A particle is in a unidirectional potential field where the potential energy (U) of a particle depends on the x-coordinate given by
U
x
= k (1 - cos ax) & k and 'a' are constants. Find the physical dimensions of 'a' & k.
Answer
2
Champ Jee
Subject: Physics
, asked on 10/4/18
Check whether (force, time, momentum) will qualify as fundamental quantities.
Answer
1
Champ Jee
Subject: Physics
, asked on 8/4/18
Answer given as option (c).
I will show my try in the answer but I can't get through.
7.In a book, the answer for a particular question is expressed as
b
=
m
a
K
1
+
2
k
l
m
a
here m represents mass ,a represents acceleration, L represents length. The unit of b should be :-
(A) m/s
(B) m/s
2
(C) meter
(D) /sec
Answer
3
Champ Jee
Subject: Physics
, asked on 8/4/18
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a
r
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x
p
r
e
s
s
i
o
n
α
i
n
e
q
.
:
l
t
=
l
0
[
1
+
α
(
T
2
-
T
1
)
]
I
s
t
h
e
a
n
s
w
e
r
K
-
1
?
Answer
1
Champ Jee
Subject: Physics
, asked on 7/4/18
6
)
∫
d
x
2
a
x
-
x
2
=
a
n
sin
-
1
x
a
-
1
.
T
h
e
v
a
l
u
e
o
f
n
i
s
(
a
)
0
(
b
)
-
1
(
c
)
1
(
d
)
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p
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b
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e
m
Answer
1
Champ Jee
Subject: Physics
, asked on 7/4/18
This question copies my curiosity.
Q.1. The metre is defined as the distance travelled by light in
1
299
,
792
,
458
second. Why didn't people choose some easier number such as
1
300
,
000
,
000
second? Why not 1 second?
Answer
2
Champ Jee
Subject: Physics
, asked on 7/4/18
T
H
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q
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f
t
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e
s
t
a
t
i
o
n
a
r
y
w
a
v
e
i
s
y
=
2
A
sin
2
π
c
t
λ
cos
n
2
π
x
λ
w
h
i
c
h
o
f
t
h
e
f
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w
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t
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m
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t
s
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w
r
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n
g
?
(
A
)
T
h
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t
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f
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t
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λ
(
B
)
T
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n
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t
o
f
x
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s
t
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f
λ
(
C
)
T
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f
2
π
c
λ
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f
2
π
x
λ
t
(
D
)
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c
λ
i
s
s
a
m
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a
s
t
h
a
t
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f
x
λ
Answer
1
Champ Jee
Subject: Physics
, asked on 7/4/18
Q.7. In a book, the answer for a particular question is expressed as b =
m
a
k
1
+
2
k
l
m
a
here m represents mass, a represents acceleration, l represents length. The unit of b should be :-
(A) m/s
(B) m/
s
2
(C) meter
(D) /sec
Answer
1
Champ Jee
Subject: Physics
, asked on 7/4/18
Any point from x-axis or y-axis (in physics) has a dimension? If yes, is it length?
Answer
1
Champ Jee
Subject: Physics
, asked on 7/4/18
Que in the pic.
Is the answer kg m^2 s^-3?
Q.2. The equation for the speed of sound in a gas states that
ν
=
γ
k
B
T
/
m
. Speed
ν
is measured in m/s,
γ
is a dimensionless constant, T is temperature in kelvin (K), and m is mass in kg. Find the SI unit for the Boltzmann constant,
k
B
?
Answer
1
Champ Jee
Subject: Physics
, asked on 7/4/18
Que in the pic!
Q. Find the dimension of
α
in :
Force =
F
0
e
-
α
t
Answer
1
1
2
3
4
5
Next
What are you looking for?
Explain in easy language because I haven't studied this topic.
Q.20. Quito, a city in Ecuador and Kampala, a city situated in Uganda both lie on the Equator. The longitude of Quito is 8230' W and that of Kampala is 3730' E. What is the distance from Quito to Kampala.
(a) along the shortest surface path
(b) along a direct (through-the-Earth) path? (The radius of the Earth is 6.4 m)
Two vectors having equal magnitudes A make an angle
with each other. Find the magnitude and direction of
the resultant.
Solution : The magnitude of the resultant will be
What does x-coordinate(what is it) have to do here? Why should we take any dimensions of it? Please explain and no links. Thank you!
[Ans : L^-1 , ML^2T^-2] by the way.
Q.1. A particle is in a unidirectional potential field where the potential energy (U) of a particle depends on the x-coordinate given by = k (1 - cos ax) & k and 'a' are constants. Find the physical dimensions of 'a' & k.
I will show my try in the answer but I can't get through.
7.In a book, the answer for a particular question is expressed as
here m represents mass ,a represents acceleration, L represents length. The unit of b should be :-
(A) m/s
(B) m/s2
(C) meter
(D) /sec
Q.1. The metre is defined as the distance travelled by light in second. Why didn't people choose some easier number such as second? Why not 1 second?
(A) m/s
(B) m/
(C) meter
(D) /sec
Is the answer kg m^2 s^-3?
Q.2. The equation for the speed of sound in a gas states that . Speed is measured in m/s, is a dimensionless constant, T is temperature in kelvin (K), and m is mass in kg. Find the SI unit for the Boltzmann constant, ?
Q. Find the dimension of in :
Force =