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Answers posted by vijayalakshmi.r
Questions
1231
answers
9
best answers
0
votes
Two identical ladders are arranged as shown in the figure, resting on a horizontal surface. Mass of each ladder is M and length L. A block of mass m hangs from the apex point P. If the system is in equilibrium, find direction and magnitude of friction force acting at A or B.
answered
Apr 1, 2016
since the system is in equilibrium, mgsintheta +Mgsintheta - N2costheta = 0, ( N2 is the component ...
0
votes
A particle of mass m is travelling with a constant velocity $\overrightarrow {V} =V_0 \hat i$ along the line $y=b,z=0$. Let $dA$ be the area swept out by the position vector from the origin to the particle in time at end L be the magnitude of angular momentum of particle about orgin at any time t. Then 1) L= constant 2) $\large\frac{dA}{dt}=\frac{L}{m}$ 3) $\large\frac{dA}{dt}= \frac{2L}{m}$ 4) $\large\frac{dA}{dt}=\frac{L}{2m}$ Which of the following is correct?
answered
Apr 1, 2016
As torque t= 0 dL/dt = 0 This implies L is a constant. or 2m dA/dt = constant = L (because L ...
0
votes
In How many ways can he take 3 courses out of 7 course
answered
Mar 30, 2016
7P3 = 7!/(7-3)! = 7!/4! = 7x6x5 = 210 ways
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votes
Angle between two smaller velocities.
answered
Mar 28, 2016
13^2 = 7^2 +8^2 +2x7x8 c0sx 169 = 49+64+112cosx Hence cosx = 56/112 = 1/2 Therefore x = 60degrees...
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p type n type npn type pnp type
answered
Mar 23, 2016
A semiconductor doped with donor impurity is N type
0
votes
how to represent the escape velocity and orbital velocity
answered
Mar 23, 2016
Let Ve be the escape velocity and Vo be the orbital velocity Ve ^2 = 2gRe and Vo = gRe therefore V...
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votes
Six dice are thrown 729 times. How many times do you expect atleast three dice to show 5 or 6.
answered
Mar 23, 2016
Probability of getting a 5 or 6 = 2/6 = 1/3 Hence p= 1/3 and q - 1-1/3 = 2/3, n = 6 and r = 3 Ther...
0
votes
how to do this question
answered
Mar 21, 2016
1/2[I]w^2 = mgh w = [3gh/l^2]^1/2
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If a is a square matrix of orders 2 and a inverse =adjA/10 then find |3A|
answered
Mar 21, 2016
This implies |A| = 10 hence |3A| = 9 x10 = 90
0
votes
cross product of vector algebra
answered
Mar 21, 2016
incomplete question
0
votes
vector algebra cross product
answered
Mar 21, 2016
Incompete question
0
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Relatn between a freely falling body and a body projected vertically down from the same height
answered
Mar 21, 2016
s= ut +1/2[at^2] 45 = 0+1/2[10xt^2] t = 3 The second stone is thrown 1 sec later hence t= 2s 4...
0
votes
Centre of rotation for triangle
answered
Mar 21, 2016
It is the cetroid, the point where the medians meet.
0
votes
physics test question from clay6
answered
Mar 21, 2016
The question seems to be incomplete. can u give the options?
0
votes
Bayes theorem ,probablity question .
answered
Mar 13, 2016
already answered . Please refer the previous questions.
0
votes
at what distance from the centre of the earth
answered
Mar 9, 2016
Let us assume that at the point P the gravitational field is zero, let D = 81R The distance between...
0
votes
why the sphere is moving with constant speed
answered
Mar 9, 2016
The question seems to be incomplete
0
votes
a semiconductor doped with a donor impurity is
answered
Mar 9, 2016
Is called N - type
0
votes
How many five letter words can be formed
answered
Mar 4, 2016
For the 11 letters it is 11C3 ways But there are3 Es, 3 NS and 2 DS Case 1: NNNDD, EEEDD,NNNEE, an...
0
votes
Find the probability of getting-
answered
Mar 3, 2016
1. Probability of getting sixes in all three dice = 1/6x 1/6 x1/6 = 1/216 Probability of getting 6 ...
0
votes
Two identical slabs are welded end to end and 20 cal of heat flows through it for 4 min. if the two slabs are now welded by placing them one above the other and the same heat is flowing through two ends under the same difference of temperature the time taken is
answered
Mar 2, 2016
dq/dt = [(AK)/2x][T2-T1] = 20/4 = 5. Therefore( AK/x)(T2-T1) = 10 When they are one above the other...
0
votes
find the area of the minor segment of a circle of radius 14cm, when its centrak angle is 60°. also find the area of the corresponding major segment?(use^=22/7)
answered
Mar 1, 2016
Area of the minor segment = (x/360)πr^2 - area of the triangle = (60/360)π(14x14) =102.67 Area of
0
votes
Ray optics and optical instruments
answered
Feb 29, 2016
1/f = 1/v - 1/u Given f = +10cm and u = -15cm therefore 1/10 = 1/v - [-1/15] this implies v = 30c...
0
votes
probability distributions
answered
Feb 28, 2016
1 = integration of 0 to 1 cx(1-x)^3 dx = int of 0 to 1c [x - 3x^2 +3x^3 - x^4] dx on integr...
0
votes
Atleast 20 characters long
answered
Feb 28, 2016
Let O be the centroid of the triangle. Then AO = BO = CO = r Force on the charge Q due q1 = [1/4pie...
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votes
Find the approximate change in the surface area of a cube.
answered
Feb 26, 2016
A = 6x^2 dA/dx = -12x or dA = -12xdx given dA = [1/100]x [dx]=( 0.01x)(-12x) = -0.12x Therefore A...
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votes
probability geometric progression
answered
Feb 26, 2016
Let E1 be the probability that a wins, E2 be the probability that B wins and E3 be the probability t...
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votes
question on probability
answered
Feb 25, 2016
P(E1) = balck ball drawn from first bag = 3/7 and P(E2) = white ball drawn f...
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votes
For what value of 'a' the vectors 2i -3j +4k and ai + 6j-8k are collinear?
answered
Feb 25, 2016
If two vectors are collinear, then 2/a = -3/6 = 4/-8 = -1/2 therefore a = -4
0
votes
Show that relative error in the volume of a sphere, due to an error in measuring the diameter is:
answered
Feb 24, 2016
V= (4/3)πr^3 = (1/6)πD^3 dv/dD=(1/2)πD^2 Let ∆D be the error in D and ∆V be the corresponding erro
0
votes
Charged cylindrical shell
answered
Feb 24, 2016
Refer qn ID 65828 in clay6 qns
0
votes
MATHEMATICS-POLYNOMIALS
answered
Feb 24, 2016
P(x)=x(x-1)(x^6+1)+15=0 This implies x has no real roots
0
votes
At what rate per cent per annum will Rs 800 amount to Rs 1000 in 2 years
answered
Feb 24, 2016
S.I = pnr/100 1000-800=200 200 = 800x2xr/100 Therefore r=12.5%
0
votes
REfractive index of a slab
answered
Feb 24, 2016
It is Brewster's angle. tan IP= √3 Therefore angle of incidence = 60°
0
votes
RAY OPTICS SPHERICAL MIRRORS
answered
Feb 24, 2016
1/v+1/u=1/f Let u=x V=32-x Substituting these values in the mirror formula ,we get X^2 -8x - 38...
0
votes
PLEASE ANSWER THIS QUESTION ON THE USES OF EDDY CURRENTS.
answered
Feb 22, 2016
the shiny metal disc in the power meter rotates due to the eddy currents. The magnet rotates inside ...
0
votes
Prove that the following functions do not have maxima or minima :
answered
Feb 17, 2016
1) f(x0 = e^x f'(x) = e^x f''(x) = e^x When f'(x)= 0 i.e., e^x = 0, but e^x is not equal to...
0
votes
Find the absolute minimum value and absolute maximum value of the given function in the following interval and also give reasons why the obtained value is abs min or abs max value.
answered
Feb 17, 2016
f(x) = x^3-12x^2+36x+17 f'(x) = 3x^2 - 24x +36 f''(x) = 6x-24 To find th emaximum or minimum valu...
0
votes
Find the equation of the line that cuts off equal intercept on the coordinate axes n passes through the point (2,3)
answered
Feb 17, 2016
Let the equation of the line be x/a + y/a =1 since it passes through (2,3) 2/a +3/a = 1 5/a = 1 ,...
0
votes
Find the coordinates of the foci, the vertices, the length of major axis, the eccentricity and the length of the maths rectum of the ellipse.
answered
Feb 11, 2016
A) a^2=b^2(1-e^2) = 100=400(1-e^2) therefore e = sq rt of 3/2 Foci = (0,10sq rt 3),(0,-sqrt3) Ver...
0
votes
Find eccentric angle of the ellipse.
answered
Feb 11, 2016
Refer Qn Id 37565. already answeredin Clay6
0
votes
The line 2x+1=0 cuts the circle x^2+y^2=4 cuts in A and B the equation of the circle with AB as diameter is
answered
Feb 10, 2016
Equation of the circle is x^2+y^2=4 Equation of the line which cuts the circle is x=-1/2 Hence the...
0
votes
find the equation if the parabola if the focus is at (0,0) the directrix x=-6
answered
Feb 7, 2016
For a parabola SP^2 = PM^2 (x-0)^2 = (y-0)2 =( x+6)^2 on expanding and simplifying we get, y^2 = ...
0
votes
To find the direction of particle after the force is applied
answered
Feb 5, 2016
the displacemant is (3-3)i+(1-2)j+(7-5)k Work done = F.d = (2i+3j-3k).(0-1j+2k) =-3-6 = -9J Hence ...
0
votes
electromagneticfield
answered
Feb 3, 2016
differentiate x^2,y^2 and Z^2 partially w.r.t x,y and z respectively dEx = 2x,dEy = 2y and dEz = 2z...
0
votes
a short straight object of length b lies along the axis of aconcave mirror offocal length f at a distance u from the pole of the mirror. the size of the image is ?
answered
Feb 3, 2016
Refer qn id 28481 https://clay6.com/qa/28481/
0
votes
A high tension supply of about 10kv must have a large internal resistance. Why?
answered
Feb 3, 2016
Because it will draw less current.
0
votes
A gold leaf electroscope is positively charged. An earthed
answered
Jan 30, 2016
Incomplete question
0
votes
The distance between Hyderabad and Khammam is 250km. Find the total space that must be left between rails to allow for a change of temperature from 15 degree celcius in winter to 45 degree celcius in summer alpha= 12*10^-6/degree celcius
answered
Jan 30, 2016
L0=250km=250×10^3m a=12×10^-6/°C Fw=15°C and Ts = 45°C LW=250×10^3(1+12×10^-6×15) =250045 Ls=250
0
votes
Electric dipole moment
answered
Jan 28, 2016
The effect of torque is to rotate the dipole to a position in which the dipole moment P is parallel ...
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