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Recent questions tagged ch3
Questions
If $A =\begin{bmatrix} x & -2 \\ 3 & 7 \end{bmatrix}$ and $A^{-1} = \begin{bmatrix} \frac{7}{34} & \frac{1}{17} \\ \frac{3}{34} & \frac{2}{17} \end{bmatrix}$ then find the value of $x $.
cbse
class12
maths
ch3
sec-b
asked
Dec 20, 2016
by
priyanka.c
1
answer
For what value of $\lambda$, the matrix $\begin{bmatrix} 1 & \lambda & 0 \\ 3 & -1 & 2 \\ 4 & 1 & 5 \end{bmatrix} $ is singular ?
cbse
class12
maths
ch3
sec-a
asked
Dec 20, 2016
by
priyanka.c
1
answer
Three shopkeepers X,Y and Z go to a store to buy stationery items. X purchases 12 dozen marker pens, 5 dozen ink pen and 6 dozen pencils. Y purchases 10 dozen marker pens, 6 dozen ink pen and 7 dozen pencils. Z purchases 11 dozen marker pens, 13 dozen ink pens and 8 dozen pencils. A marker pen cost Rs 40/- , a pen costs Rs. 7/- and a pencil Rs. 1 /- each. Using matrix multiplication calculate the individual bills of X, Y and Z.
cbse
class12
maths
ch3
sec-c
asked
Dec 9, 2016
by
priyanka.c
1
answer
For what values of $x$ and $y$ are the following matrices equal ? $A = \begin{bmatrix} 2x+1 & 3y \\ 0 & y^2-5y \end{bmatrix} , B = \begin{bmatrix} x+3 & y^2+2 \\ 0 &-6 \end{bmatrix}$
cbse
class12
maths
ch3
sec-e
asked
Dec 8, 2016
by
priyanka.c
1
answer
If A and B are symmetric matrices, prove that AB - BA is a skew symmetric matrix
cbse
class12
maths
ch3
sec-e
asked
Dec 6, 2016
by
priyanka.c
1
answer
Evaluate : $\tan^{-1} (1) + cos^{-1} ( \frac{-1}{2} )+ \sin^{-1} (\frac{-1}{2})$
cbse
class12
maths
sec-e
ch3
asked
Dec 5, 2016
by
priyanka.c
2
answers
If $A = \begin{bmatrix} 1 & \tan x \\ -\tan x & 1 \end{bmatrix} $ , Evaluate $A^TA^{-1}$
cbse
class12
maths
sec-c
ch3
asked
Dec 1, 2016
by
priyanka.c
1
answer
Find the value of x if $\begin{bmatrix} x & -5 & -1 \end{bmatrix} \begin{bmatrix} 1 & 0 & 2 \\ 0 & 2 & 1 \\ 2& 0 & 3 \end{bmatrix} \begin{bmatrix} x \\ 4 \\ 1 \end{bmatrix} = 0$
cbse
class12
maths
ch3
sec-b
asked
Nov 23, 2016
by
priyanka.c
1
answer
Use matrix method to examine if the following system of equation for consistency or inconsistency $4x - 2y = 3, \; \; 6x - 3y = 5$
cbse
class12
maths
sec-e
ch3
asked
Nov 22, 2016
by
priyanka.c
1
answer
Using elementary row transformation, find the inverse of $A = \begin{bmatrix} 2 & -6 \\ 1 & -2\end{bmatrix}$
cbse
class12
maths
sec-e
ch3
asked
Nov 21, 2016
by
priyanka.c
1
answer
Find X and Y, if $X + Y= \begin{bmatrix} 5 & 2 \\ 0 & 9 \end{bmatrix}$ and $X - Y = \begin{bmatrix} 3 & 6 \\ 0 & -1 \end{bmatrix}$
cbse
class12
maths
sec-e
ch3
asked
Nov 20, 2016
by
priyanka.c
1
answer
If $ A = \begin{bmatrix} \cos\theta & -\sin\theta \\ \sin\theta & \cos\theta \end{bmatrix}$, then find the value of $\theta$ satisfying the equation $A^T + A = I_2$
cbse
class12
maths
sec-e
ch3
asked
Nov 20, 2016
by
priyanka.c
1
answer
If $A=\begin{bmatrix} 9 & 1 \\ 7 & 8 \end{bmatrix} $, $B =\begin{bmatrix} 1 & 5 \\ 7 & 12 \end{bmatrix}$ find matrix C such that 5A + 3B + 2C is a null matrix.
cbse
class12
maths
sec-e
ch3
asked
Nov 17, 2016
by
priyanka.c
1
answer
The rate of reaction for A---> products is 10 mol.lit-1.min-1 at time t1=5minutes. what will be the rate at the time t2=10minutes
cbse
class12
jeemain
physical-chemistry
difficult
ch3
kinetics
chemical
asked
Jul 7, 2015
by
excellentdeals18
1
answer
change in hormonal levels during ovulation.
biology
class12
aipmt
ch3
reproduction
asked
Jan 30, 2015
by
aradhya.dutta200
1
answer
A feather is dropped on the moon from a height of $1.40\; meters$. The acceleration of gravity on the moon is $1.67 m/s^2$. Determine the time for the feather to fall to the surface of the moon
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
motion-under-gravity
easy
asked
Aug 20, 2014
by
meena.p
1
answer
Dhoni throws his bat vertically upwards with an initial velocity of $26.2\;m/s$ Determine the height to which the bat will rise above its initial height.
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
motion-under-gravity
medium
asked
Aug 20, 2014
by
meena.p
2
answers
Raju drops a pile of marbles from the top of a roof located $8.52\;m$ above the ground. Determine the time required for the marbles to reach the ground .
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
motion-under-gravity
easy
asked
Aug 19, 2014
by
meena.p
1
answer
From the top of a building 40 m tall, a ball a thrown vertically upwards with a velocity of $10\; ms^{-1}$ After how long will the ball hit the ground?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
asked
Aug 19, 2014
by
meena.p
2
answers
A body moving in a straight line covers a distance of $14 m $ in the 5th second and 20 m in the 8th second. How much distance will it cover in the 15th second ?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
A marble rolls across a flat surface. Its initial speed is 41 m/s but it comes to rest after 10 seconds . Find the acceleration of the marble and the distance traveled by the marble as it comes to rest.
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
A car acceleration from rest at a constant rate $\alpha$ for some time after which it decelerates at a constant rate $\beta$ to come to rest. If t is the total time elapsed , then the maximum velocity attained by the car is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
An electron starting from rest has a velocity that increases linearly with time i.e $v= kt$ where $k=2\;m\;s^{-2}$. The distance covered in the first 3 second is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
cbse11
ch2
motion-in-straight-line
asked
Aug 19, 2014
by
meena.p
1
answer
A steel ball is bouncing up and down on a steel plate with a period of oscillation of 1 second. If $g= 10\;ms^{-2}$, then if bounces up to a height of
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
A body travelling with uniform acceleration crosses two points A and B with velocities $20\;ms^{-1}$ and $30 \;ms^{-1}$ respectively . The speed of the body at the mid-point of A and B is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
asked
Aug 19, 2014
by
meena.p
1
answer
A bus starts from rest with an acceleration of $ 1\;ms^{-2}$ A man who is $48\;m$ behind the bus starts with a uniform velocity of $ 10\;ms^{-1}$. The minimum time after which the man will catch the bus is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
asked
Aug 19, 2014
by
meena.p
1
answer
A stone is allowed to fall from the top of tower 100 metre high and at the same time another stone is projected vertically upwards from the ground with a velocity of $25\;ms^{-1} $. The two stones will meets after
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
The displacement x of a particle at the instant when its velocity is v is given by $ v = \sqrt {3x+16}$ . Its acceleration and initial velocity are
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
The distance through which a body falls in the nth seconds is h. The distance through which it falls in the next seconds is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 19, 2014
by
meena.p
1
answer
A stone is thrown upwards with velocity v. At half the height, its velocity is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
asked
Aug 14, 2014
by
meena.p
1
answer
A ball is thrown vertically upwards from the top of a tower of height h with velocity v. The ball strikes the ground after
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
asked
Aug 14, 2014
by
meena.p
1
answer
A small block slides without friction down an inclined plane starting from rest. Let $S_n$ be the distance travelled from time $t- n-1$ to $t=n$. Then $\large\frac{S_n}{S_{n_1}}$ is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
medium
asked
Aug 14, 2014
by
meena.p
1
answer
A car travelling on a straight road at $15.0$ meter per second accelerates uniformly to a speed of $21.0$ meters per second in $12.0 \;second$. The total distance traveled by the car in this $12.0 $ second time interval is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 14, 2014
by
meena.p
1
answer
An astronaut standing on a platform on the Moon drops a hammer. If the hammer falls $6.0 $ meters vertically in $2.7 \;seconds$, what is its acceleration ?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 14, 2014
by
meena.p
1
answer
A dart is thrown at a target that is supported by a wooden backstop. It strikes the backstop with an initial velocity of $350\;m/s$ The dart comes to rest in $0.0050\;s$ What is the acceleration of the dart ?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 14, 2014
by
meena.p
1
answer
A sailboat acceleration uniformly from $6.0\;m/s$ to $ 8.0 [N]$ at a rate of $0.50\;m/s^2$. What distance does the boat travel ?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 13, 2014
by
meena.p
1
answer
A sports car approaches a highway on-ramp at a velocity of $20.0\;m/s $ . If the car accelerates at a rate of $3.2 \;m/s^2 $ for $5.0\;s$ , What is the displacement of the car ?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 13, 2014
by
meena.p
1
answer
A car is moving at a speed $50 \;km /h$ two seconds there it is moving at $60 \;km/h$ Calculate the acceleration of the car.
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 13, 2014
by
meena.p
1
answer
A car starts from rest , moves with an acceleration $a$ and then decelerates at $b$ for some time to come to rest. If the total time taken is t, the maximum velocity is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 13, 2014
by
meena.p
1
answer
A car staring from rest acceleration at the rate $f$ through a distance $S$, then continues at constant speed for time $t$ and then decelerates at rate $\large\frac{f}{2}$ to come to rest. If the total distance covered is $15\;s$ , then
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 13, 2014
by
meena.p
1
answer
The relation between time t and distance $x$ is $t= ax^2+bx$ where a and b are constants . The acceleration is
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 13, 2014
by
meena.p
1
answer
The position of a particle as a function of time is given by equation: $x =2t^3-6t^2+12t+6$. The acceleration of the body is zero at
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
acceleration
easy
asked
Aug 12, 2014
by
meena.p
1
answer
The position of a particle moving along the $x$-axis ($x$ is in $m$) is given by $x = t^3 - 3t^2 + 2t$. Find the average speed of the particle in the interval $t=2\;s \rightarrow t = 4\;s$
cl52417
speed-and-velocity
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
easy
asked
Aug 12, 2014
by
balaji.thirumalai
1
answer
The position of a particle moving along the $x$-axis ($x$ is in $m$) is given by $x = t^3 - 3t^2 + 2t$. Find the velocity of the particle at $t=2\;s$.
speed-and-velocity
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
easy
asked
Aug 12, 2014
by
balaji.thirumalai
1
answer
A body covers a certain distance x in equal thirds - the first third of distance with speed v$_1$, the second third with a speed of v$_2$ and the last third with a speed of v$_3$. What is the average speed of the body over time?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
average-speed
easy
asked
Aug 11, 2014
by
balaji.thirumalai
2
answers
A body travels first half a distance with velocity v$_0$. The remaining distance was covered with velocity v$_1$ for half the time and v$_2$ for the remaining time. Find the average velocity over the whole time of motion?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
easy
asked
Aug 11, 2014
by
balaji.thirumalai
1
answer
Consider the following one-dimensional motion.A spacecraft drifts through space at constant velocity. Which of the following statements are true?
cl52390
cl52389
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
easy
average-velocity
instantaneous-velocity
asked
Aug 11, 2014
by
balaji.thirumalai
1
answer
Consider the following one-dimensional motion. A race car starts from rest and speeds up to 100 m/s. Which of the following statements are true?
cl52389
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
easy
average-velocity
instantaneous-velocity
asked
Aug 11, 2014
by
balaji.thirumalai
1
answer
Consider the following one-dimensional motion. A ball thrown directly upward rises to a highest point and falls back into the throwerâ€™s hand. Which of the following statements are true?
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
easy
motion-under-gravity
asked
Aug 11, 2014
by
balaji.thirumalai
1
answer
If $\varepsilon_{C-C}=348kJmol^{-1},\varepsilon_{C-H}=412kJ mol^{-1}$ and $\varepsilon_{H-H}=436KJ mol^{-1}$,the pauling electronegativity of C is about (Given : electronegativity of H =2.1)
jeemain
chemistry
inorganic-chemistry
class11
ch3
classification-of-elements-and-periodicity-of-properties
periodicity
electronegativity
medium
asked
Jul 28, 2014
by
sreemathi.v
1
answer
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