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Prakhar
Subject: Physics
, asked on 22/5/18
Q. If a system has its fundamental unit as 10 g, 1 dm and 1 min, then find the value of 75 watt.
Answer
1
Arghojyoti Swami
Subject: Physics
, asked on 22/5/18
Pls solve the 30th question
Q.30. If F =
$\frac{2}{\mathrm{sin}\theta +\sqrt{3}\mathrm{cos}\theta}$
. Find the minimum value of F.
(1) 1
(2) 2
(3) 3
(4) 4
Answer
3
Arghojyoti Swami
Subject: Physics
, asked on 22/5/18
Q.20. If
$y=A\mathrm{sin}\left(t+\mathrm{\pi}\right)$
then slope of y vs t graph is best represented by
Answer
1
Arghojyoti Swami
Subject: Physics
, asked on 22/5/18
Q.5. If
$y=\frac{1}{\mathrm{cos}\theta +\mu \mathrm{sin}\theta}$
, then the value of
$\frac{dy}{d\theta}$
is
Answer
1
Khushi Jain
Subject: Physics
, asked on 21/5/18
is 1st chapter of phy not important?
Answer
1
Prakhar
Subject: Physics
, asked on 20/5/18
Q. What does the line 'coincides with 25th division of main scale' mean? can u please help me with diagram?
The main scale reading of a screw gauge is 8 mm and the circular scale coincides with
${25}^{th}$
division of the main scale. If the pitch of the screw gauge is 0.5 mm and the number of circular scale division is 100, then the observed reading will be
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
Q127. Three vectors
$\overrightarrow{\mathrm{A}}\overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{\mathrm{C}}$
are given such that
$\overrightarrow{\mathrm{A}}=\frac{3\hat{\mathrm{i}}+4\hat{\mathrm{j}}}{5}+\mathrm{B}=\frac{-4\hat{\mathrm{i}}+3\hat{\mathrm{j}}}{5}$
and
$\overrightarrow{\mathrm{C}}=4\hat{\mathrm{i}}+3\hat{\mathrm{j}}$
. Two or more vectors are given in
Column I
. Certain statements are given in
Column II
. Match the vectors given in
Column I
with the statements in
Column II
.
Column I
Column II
(A)
$\overrightarrow{\mathrm{A}},\overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{\mathrm{A}}\times \overrightarrow{\mathrm{B}}$
(B)
$\overrightarrow{\mathrm{A}},\overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{C}$
(C)
$\overrightarrow{\mathrm{A}}\times \overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{\mathrm{A}}$
(D)
$\overrightarrow{C}\times \overrightarrow{\mathrm{A}}\mathrm{and}\overrightarrow{\mathrm{A}}+\overrightarrow{\mathrm{B}}$
(p) are all unit vectors
(q) are mutually perpendicular vectors
(r) are collinear vectors
(s) are coplanar vectors
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
Q. The velocity versus time graph for a particle is shown in figure. The correct statement regarding its motion is
(1) The particle is undergoing uniform motion
(2) The acceleration of particle is zero at t = 3 s.
(3) The velocity of particle at t = 5 s is zero
(4) The acceleration of the particle is zero at t = 6 s.
Answer
1
Romil Singh
Subject: Physics
, asked on 19/5/18
Solve this:
Q115. A vector of length
$5\sqrt{5}$
m in the x y plane that is perpendicular to
$\overrightarrow{\mathrm{A}}=3\hat{\mathrm{i}}+6\hat{\mathrm{j}}-2\hat{\mathrm{k}}$
m is/are
$\left(\mathrm{A}\right)10\hat{\mathrm{i}}+5\hat{\mathrm{j}}\mathrm{m}\left(\mathrm{B}\right)10\hat{\mathrm{i}}-5\hat{\mathrm{j}}\mathrm{m}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)-10\hat{\mathrm{i}}+5\hat{\mathrm{j}}\mathrm{m}\left(\mathrm{D}\right)-10\hat{\mathrm{i}}-5\hat{\mathrm{j}}\mathrm{m}$
Answer
3
Neil Singh
Subject: Physics
, asked on 19/5/18
How does the earth's atmosphere stick to earth while earth is spinning?
Answer
1
Neil Singh
Subject: Physics
, asked on 18/5/18
Why don't stars appear red?? Their distance from the earth is a lot. Since the sun appears red due to the same reason....stars also should.
Answer
2
अर्कज
Subject: Physics
, asked on 18/5/18
Explain:
Answer
1
अर्कज
Subject: Physics
, asked on 18/5/18
Explain:
Answer
2
अर्कज
Subject: Physics
, asked on 18/5/18
$Twovectorsofequalmagnitude5unithaveanangle60\xb0them.Findthemagnitudeof\left(a\right)thesumofthevectorsand\left(b\right)thedlfferenceofthevectors.$
Answer
2
अर्कज
Subject: Physics
, asked on 18/5/18
Explain:
Answer
2
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What are you looking for?

Q. If a system has its fundamental unit as 10 g, 1 dm and 1 min, then find the value of 75 watt.

Q.30. If F = $\frac{2}{\mathrm{sin}\theta +\sqrt{3}\mathrm{cos}\theta}$. Find the minimum value of F.

(1) 1

(2) 2

(3) 3

(4) 4

The main scale reading of a screw gauge is 8 mm and the circular scale coincides with ${25}^{th}$ division of the main scale. If the pitch of the screw gauge is 0.5 mm and the number of circular scale division is 100, then the observed reading will be

Q127. Three vectors $\overrightarrow{\mathrm{A}}\overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{\mathrm{C}}$ are given such that $\overrightarrow{\mathrm{A}}=\frac{3\hat{\mathrm{i}}+4\hat{\mathrm{j}}}{5}+\mathrm{B}=\frac{-4\hat{\mathrm{i}}+3\hat{\mathrm{j}}}{5}$ and $\overrightarrow{\mathrm{C}}=4\hat{\mathrm{i}}+3\hat{\mathrm{j}}$. Two or more vectors are given in

Column I. Certain statements are given inColumn II. Match the vectors given inColumn Iwith the statements inColumn II.Column IColumn II(B) $\overrightarrow{\mathrm{A}},\overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{C}$

(C) $\overrightarrow{\mathrm{A}}\times \overrightarrow{\mathrm{B}}\mathrm{and}\overrightarrow{\mathrm{A}}$

(D) $\overrightarrow{C}\times \overrightarrow{\mathrm{A}}\mathrm{and}\overrightarrow{\mathrm{A}}+\overrightarrow{\mathrm{B}}$

(q) are mutually perpendicular vectors

(r) are collinear vectors

(s) are coplanar vectors

Q. The velocity versus time graph for a particle is shown in figure. The correct statement regarding its motion is

(1) The particle is undergoing uniform motion

(2) The acceleration of particle is zero at t = 3 s.

(3) The velocity of particle at t = 5 s is zero

(4) The acceleration of the particle is zero at t = 6 s.

Q115. A vector of length $5\sqrt{5}$ m in the x y plane that is perpendicular to $\overrightarrow{\mathrm{A}}=3\hat{\mathrm{i}}+6\hat{\mathrm{j}}-2\hat{\mathrm{k}}$ m is/are

$\left(\mathrm{A}\right)10\hat{\mathrm{i}}+5\hat{\mathrm{j}}\mathrm{m}\left(\mathrm{B}\right)10\hat{\mathrm{i}}-5\hat{\mathrm{j}}\mathrm{m}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{C}\right)-10\hat{\mathrm{i}}+5\hat{\mathrm{j}}\mathrm{m}\left(\mathrm{D}\right)-10\hat{\mathrm{i}}-5\hat{\mathrm{j}}\mathrm{m}$