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Taniqsha
Subject: Physics
, asked on 9/5/18
car is traveling in a straight line60km/h n following by other car 70km/ h at the distance of 2.5km other car deceleration of 20km/h find distance n time that it can catch first car
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this :
85
.
T
w
o
f
o
r
c
e
s
F
→
1
a
n
d
F
→
2
a
c
t
i
n
g
a
t
a
p
o
i
n
t
a
r
e
s
u
c
h
t
h
a
t
i
f
F
→
1
i
s
r
e
v
e
r
s
e
d
,
t
h
e
d
i
r
e
c
t
i
o
n
o
f
t
h
e
r
e
s
u
l
tan
t
i
s
t
u
r
n
e
d
t
h
r
o
u
g
h
90
°
.
T
h
e
n
(
A
)
F
→
1
=
F
→
2
(
B
)
F
→
1
a
n
d
2
F
→
2
(
C
)
F
→
1
=
F
→
2
2
(
D
)
N
o
r
e
l
a
t
i
o
n
b
e
t
w
e
e
n
F
→
1
a
n
d
F
→
2
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Sir I have seen the link but I didn't understand please send the solution
83
.
A
→
=
2
i
^
+
3
j
^
a
n
d
B
→
=
i
^
+
j
^
.
T
h
e
v
e
c
t
o
r
c
o
m
p
o
n
e
n
t
o
f
A
→
i
n
t
h
e
d
i
r
e
c
t
i
o
n
o
f
B
→
i
s
(
A
)
15
i
^
+
j
^
2
(
B
)
5
(
C
)
5
2
i
^
+
j
^
(
D
)
5
4
2
i
^
+
3
j
^
83
.
A
→
=
2
i
^
+
3
j
^
a
n
d
B
→
=
i
^
+
j
^
.
T
h
e
v
e
c
t
o
r
c
o
m
p
o
n
e
n
t
o
f
A
→
i
n
t
h
e
d
i
r
e
c
t
i
o
n
o
f
B
→
i
s
(
A
)
15
i
^
+
j
^
2
(
B
)
5
(
C
)
5
2
i
^
+
j
^
(
D
)
5
4
2
i
^
+
3
j
^
Answer
2
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
79
.
F
i
g
u
r
e
s
h
o
w
s
v
e
c
t
o
r
A
→
a
n
d
f
o
u
r
o
t
h
e
r
v
e
c
t
o
r
s
t
h
a
t
h
a
v
e
t
h
e
s
a
m
e
m
a
g
n
i
t
u
d
e
b
u
t
d
i
f
f
e
r
i
n
o
r
i
e
n
t
a
t
i
o
n
.
T
h
e
v
e
c
t
o
r
s
w
h
i
c
h
h
a
v
e
t
h
e
s
a
m
e
d
o
t
p
r
o
d
u
c
t
w
i
t
h
A
→
a
r
e
:
(
i
)
B
→
a
n
d
C
→
(
i
i
)
D
→
a
n
d
E
→
(
i
i
i
)
D
→
a
n
d
C
→
(
i
v
)
B
→
a
n
d
E
→
(A) (i) and (ii) (B) (i) and (iii)
(C) (ii) and (iv) (D) (iv) and (iii)
Answer
2
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this: .
Q.70 A bird flies 25.0 m in the direction 55
°
east of south to its nest. The bird then flies 75.0 m in the direction 55
°
west of north. What are the northward and westward components of the resultant displacement of the bird from its nest?
northward westward
(A) 29 m 41 m
(B) 41 m 29 m
(C) 35 m 35 m
(D) 81 m 57m
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
Q). Two vectors have magnitude of 10 m and 15 m. The angle between them when they are drawn with their tails at the same point is 30
°
. The component of the longer vector along the line perpendicular to the shorter vector, in the plane of the vectors, is
(A) Zero
(B) 13
(C) 7.5
(D) 5.0
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
64. If
A
→
=
3
i
^
+
4
j
^
a
n
d
B
→
=
7
i
^
+
24
j
^
,
then the vector having the same magnitude as
B
→
and parallel to
A
→
is
(
A
)
75
i
^
+
100
j
^
(
B
)
15
i
^
+
20
j
^
(
C
)
29
5
(
3
i
^
+
4
j
^
)
(
D
)
20
i
^
+
15
j
^
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
67. An escaped convict runs 1 .70 km due east of the prison. He then runs due north to a friend's house.
If the magnitude of the convier's total displacement vector is 2.50 km, what is the direction of his total displacement vector with respect to due east?
Answer
3
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
59.
F
o
u
r
v
e
c
t
o
r
s
(
A
→
,
B
→
,
C
→
,
D
→
)
a
l
l
h
a
v
e
t
h
e
s
a
m
e
m
a
g
n
i
t
u
d
e
.
T
h
e
a
n
g
l
e
θ
b
e
t
w
e
e
n
a
d
j
a
c
e
n
t
v
e
c
t
o
r
s
i
s
45
°
a
s
s
h
o
w
n
.
T
h
e
c
o
r
r
e
c
t
v
e
t
o
r
e
q
u
a
t
i
o
n
i
s
A
A
⇀
-
B
⇀
-
C
⇀
+
D
⇀
=
0
B
B
→
+
D
→
-
2
C
→
=
0
C
A
⇀
+
B
⇀
=
B
⇀
+
D
⇀
D
A
→
+
B
→
+
C
→
+
D
→
=
0
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
23) Figure shows a regular hexagon abcdef with o as centre. The correct expression about the hexagon is.
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
75. Two forces
F
1
→
=
5
i
^
+
10
j
^
-
20
k
^
a
n
d
F
2
→
=
10
i
^
-
5
j
^
-
15
k
^
act on a single point. The angle between
F
1
→
a
n
d
F
2
→
is nearly
(A) 30
°
(B) 45
°
(C) 60
°
(D) 90
°
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Q.61. In the diagram,
A
→
has magnitude 12 m and
B
→
has magnitude 8 m. The x component
A
→
+
B
→
is about
(A) 5.5 m
(B) 7.6 m
(C) 12 m
(D) 14 m
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Q.57. A particle is acted upon by forces in one plane equal to
2
,
2
2
and 1 N, respectively. The first is horizontal, the second acts at
45
°
to the horizontal and the third is vertical. Their resultant is
Answer
1
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
Q) A man walks 4.0 m towards east and then turns 60
°
to the north of east and again walks for 4.0 m. The net displacement magnitude is
(A) 6 m
(B) 8 m
(C) 6.9 m
(D) 5 m
Answer
3
Romil Singh
Subject: Physics
, asked on 9/5/18
Solve this:
Q. Given :
a
→
+
b
→
+
c
→
=
0
. Out of the three vectors
a
→
,
b
→
and
c
→
and two are equal in magnitude. The magnitude of the third vector is
2
times that of either of the two having equal magnitude. The angle between the vectors are:
(A) 90°, 135° , 135° (B) 30°, 60°, 90°
(C) 45° , 45°, 90° (D) 45°, 60°, 90°
Answer
2
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(C) (ii) and (iv) (D) (iv) and (iii)
Q.70 A bird flies 25.0 m in the direction 55 east of south to its nest. The bird then flies 75.0 m in the direction 55 west of north. What are the northward and westward components of the resultant displacement of the bird from its nest?
northward westward
(A) 29 m 41 m
(B) 41 m 29 m
(C) 35 m 35 m
(D) 81 m 57m
Q). Two vectors have magnitude of 10 m and 15 m. The angle between them when they are drawn with their tails at the same point is 30. The component of the longer vector along the line perpendicular to the shorter vector, in the plane of the vectors, is
(A) Zero
(B) 13
(C) 7.5
(D) 5.0
64. If then the vector having the same magnitude as and parallel to is
If the magnitude of the convier's total displacement vector is 2.50 km, what is the direction of his total displacement vector with respect to due east?
59.
75. Two forces act on a single point. The angle between is nearly
(A) 30
(B) 45
(C) 60
(D) 90
(A) 5.5 m
(B) 7.6 m
(C) 12 m
(D) 14 m
Q) A man walks 4.0 m towards east and then turns 60 to the north of east and again walks for 4.0 m. The net displacement magnitude is
(A) 6 m
(B) 8 m
(C) 6.9 m
(D) 5 m
Q. Given : . Out of the three vectors and two are equal in magnitude. The magnitude of the third vector is times that of either of the two having equal magnitude. The angle between the vectors are:
(A) 90°, 135° , 135° (B) 30°, 60°, 90°
(C) 45° , 45°, 90° (D) 45°, 60°, 90°