# Posts by salman

Total # Posts: 157

**Physics**

Half life of radium is 44 years.The sample will reduce to 50% of its orignal value after how many years?

*January 28, 2017*

**science chemistry**

Explain how Particles moves in solid lead,molten solid,gaseous lead in these three state of matter

*January 21, 2017*

**business maths**

a young couple wants to save rs 1,200,000

*January 2, 2017*

**maths**

the four angles of a qudrilaterala are as 3:5:7:9.find the lengths ?

*December 28, 2016*

**physics**

50 gm,0gm,100gm,100gm

*December 6, 2015*

**Science HELP!!!!**

Gamma rays

*December 10, 2013*

**math**

if a river flows south at 10 km/h and a boat moves north against the current at a rate of 18km/hr, what is the net actual speed of the boat in the water

*January 27, 2013*

**physics**

A machine gun fires 20 bullets per second in to a target. Each bullet weight 10 gm and has a speed of 1500m/s; Find the Force necessary to hold the gun in position.

*September 11, 2012*

**Science**

What is principal of the experiment to determine the ion conduct in the given iron ore by using an external indicator?

*August 5, 2011*

**Math**

If the sides of a quadrilateral are in the ratio of 3:5:7:9 and the perimeter is 240 inches, find the length of each side. Math - PsyDAG, Wednesday, April 13, 2011 at 11:51am 3x + 5x + 7x + 9x = 24x = 240 x = 10 3x = ? 5x = ? 7x = ? 9x = ? How x=10???

*April 12, 2011*

**Stats and Data**

Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0 <x<1 Instrument 2 yields a measurement whose p.d.f. is f2(x)=3x^2, 0 <x<1 Suppose that one of the two instruments is...

*December 2, 2010*

**Math**

Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0 <x<1 Instrument 2 yields a measurement whose p.d.f. is f2(x)=3x^2, 0 <x<1 Suppose that one of the two instruments is...

*December 2, 2010*

**Maths**

Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0 <x<1 Instrument 2 yields a measurement whose p.d.f. is f2(x)=3x^2, 0 <x<1 Suppose that one of the two instruments is...

*December 2, 2010*

**Statistics**

Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0 <x<1 Instrument 2 yields a measurement whose p.d.f. is f2(x)=3x^2, 0 <x<1 Suppose that one of the two instruments is...

*December 2, 2010*

**calculus**

Find the volume of the solid obtained by revolving the graph of y=7x*(4-x^2)^(1/2) over [0,2] about the y-axis

*October 10, 2010*

**Maths**

Evaluate the triple integral _E (xy)dV where E is a solid tetrahedron with vertices (0,0,0), (4,0,0), (0,1,0), (0,0,4)

*April 28, 2010*

**Calculus**

Evaluate the triple integral _E (xy)dV where E is a solid tetrahedron with vertices (0,0,0), (4,0,0), (0,1,0), (0,0,4)

*April 28, 2010*

**Calculus**

Evaluate the triple integral _E (xy)dV where E is a solid tetrahedron with vertices (0,0,0), (4,0,0), (0,1,0), (0,0,4) I just can't seem to find the limits, of x,y and z

*April 26, 2010*

**Maths**

Evaluate the triple integral _E (xy)dV where E is a solid tetrahedron with vertices (0,0,0), (4,0,0), (0,1,0), (0,0,4) I just can't seem to find the limits, of x,y and z

*April 26, 2010*

**Math**

Evaluate the triple integral _E (xy)dV where E is a solid tetrahedron with vertices (0,0,0), (4,0,0), (0,1,0), (0,0,4) I just can't seem to find the limits, of x,y and z

*April 26, 2010*

**Calculus**

Evaluate the triple integral ∫∫∫_E (xyz)dV where E is the solid: 0<=z<=5, 0<=y<=z, 0<=x<=y.

*April 23, 2010*

**Calculus**

Evaluate the triple integral ∫∫∫_E (z)dV where E is the solid bounded by the cylinder y^2+z^2=1225 and the planes x=0, y=7x and z=0 in the first octant.

*April 23, 2010*

**Calculus**

Evaluate the triple integral ∫∫∫_E (x^2.e^y)dV where E is bounded by the parabolic cylinder z=1−y^2 and the planes z=0, x=1 and x=−1.

*April 23, 2010*

**Calculus**

Use a triple integral to find the volume of the solid enclosed by the paraboloid x=8y^2+8z^2 and the plane x=8.

*April 23, 2010*

**Calculus**

Evaluate the triple integral ∫∫∫_E (xy)dV where E is the solid tetrahedon with vertices (0,0,0), (4,0,0), (0,1,0), (0,0,4)

*April 23, 2010*

**Calculus**

Use a triple integral to find the volume of the solid bounded by the parabolic cylinder y=3x^2 and the planes z=0,z=2 and y=1.

*April 23, 2010*

**Calculus**

Evaluate the triple integral ∫∫∫_E (x+y)dV where E is bounded by the parabolic cylinder y=5x^2 and the planes z=9x, y=20x and z=0.

*April 23, 2010*

**Calculus**

Evaluate the triple integral ∫∫∫_E (x)dV where E is the solid bounded by the paraboloid x=10y^2+10z^2 and x=10

*April 23, 2010*

**Calculus**

Suppose that ∫∫_D f(x,y)dA=3 where D is the disk x^2+y^2<=16. Now suppose E is the disk x^2+y^2<=144 and g(x)=3f(x/3,y/3), what is the value of the integral of ∫∫_E g(x,y)dA?

*April 17, 2010*

**Calculus**

the answer u gave me is incorrect. and please tell me the method u tried

*April 17, 2010*

**Calculus**

Using polar coordinates, evaluate the integral which gives the area which lies in the first quadrant between the circles x^2+y^2=64 and x^2 - 8x + y^2 = 0.

*April 17, 2010*

**Calculus**

Consider the transformation T:x=(41/40)u−(9/41)v , y=(9/41)u+(40/41)v A. Computer the Jacobian: delta(x,y)/delta(u,v)= ? B. The transformation is linear, which implies that it transforms lines into lines. Thus, it transforms the square S:−41<=u<=41, −41...

*April 14, 2010*

**Calculus**

Consider the solid that lies above the square (in the xy-plane) R=[0,2]*[0,2], and below the elliptic paraboloid z=100−x^2−4y^2. (A) Estimate the volume by dividing R into 4 equal squares and choosing the sample points to lie in the lower left hand corners. (B) ...

*April 14, 2010*

**Calculus**

Find the maximum and minimum values of f(x,y)=3x+y on the ellipse x^2+4y^2=1

*April 14, 2010*

**Calculus**

Find the maximum and minimum values of f(x,y,z)=3x+1y+5z on the sphere x^2+y^2+z^2=1

*April 2, 2010*

**Economics**

If investment is dependent on income in addition to interest rate (assuming C and G have usual forms) then the Keynesian multiplier will A. Not Exist B. Equal to as compared to the case where investment is not dependent on Y C. Smaller as compared to the case where investment ...

*March 17, 2010*

**Economics**

If investment is dependent on income in addition to interest rate (assuming C and G have usual forms) then the Keynesian multiplier will A. Not Exist B. Equal to as compared to the case where investment is not dependent on Y C. Smaller as compared to the case where investment ...

*March 17, 2010*

**Economics**

The Keynesian Multiplier under lump sum taxes A. Smaller than that under proportional tax B. Equal to that under proportional tax C. Larger than that under proportional tax D. Can be larger or smaller depending upon the size of the tax Choose the right answer from A, B, C or D?

*March 17, 2010*

**Calculus**

Find an equation of the tangent plane (in the variables x, y and z) to the parametric surface r(u,v) =(2u, 3u^2+5v, -4v^2) at the point (0,-10,-16)

*March 4, 2010*

**Calculus**

Find an equation of the tangent plane (in the variables x, y and z) to the parametric surface r(u,v) =(2u, 3u^2+5v, -4v^2) at the point (0,-10,-16)

*March 4, 2010*

**Calculus**

A system of equations is given by: F1(x,y,a,b) = x² + bxy + y² - a – 2 = 0 F2(x,y,a,b) = x² + y ² - b² + 2a + 3 = 0 Where x and y are endogenous variables while a and b are exogenous variables. Compute the differentials δx/δb and δ...

*March 1, 2010*

**Calculus**

Find the partial derivative y with respect to s for the following function: y=[((x1)^2)+(x1)(x2)+((x2)^2)]/((x1)+(x2)) where x1=s+2 and x2=s^2+t^2+t . x1 means x subscript 1 x2 means x subscript 2

*February 28, 2010*

**Calculus**

A system of equations is given by: F1(x,y,a,b) = x² + bxy + y² - a – 2 = 0 F2(x,y,a,b) = x² + y ² - b² + 2a + 3 = 0 Where x and y are endogenous variables while a and b are exogenous variables. Compute the differentials δx/δb and δy...

*February 28, 2010*

**Calculus**

A system of equations is given by: F1(x,y,a,b) = x² + bxy + y² - a – 2 = 0 F2(x,y,a,b) = x² + y ² - b² + 2a + 3 = 0 Where x and y are endogenous variables while a and b are exogenous variables. Compute the differentials δx/δb and δy...

*February 27, 2010*

**Calculus**

Find the total derivative dz/dt, given z=f(x,y,t) where x=a+bt and y=c+dt

*February 27, 2010*

**Calculus**

Find the partial derivative y with respect to s for the following function: y=[((x_1)^2)+(x_1)(x_2)+((x_2)^2)]/((x_1)+(x_2)) where x_1=s+2 and x_2=s^2+t^2+t . The underscore (_) stands for subscript

*February 27, 2010*

**Economics**

A system of equations is given by: F1(x,y,a,b) = x² + bxy + y² - a – 2 = 0 F2(x,y,a,b) = x² + y ² - b² + 2a + 3 = 0 Where x and y are endogenous variables while a and b are exogenous variables. Compute the differentials δx/δb and δy...

*February 27, 2010*

**Calculus**

Represent the function f(x)= 10ln(8-x) as a Maclaurin series and Find the radius of convergence

*February 27, 2010*

**Math**

Find the total derivative dz/dt, given z=f(x,y,t) where x=a+bt and y=c+dt

*February 26, 2010*

**Math**

Find the partial derivative y with respect to s for the following function: y=[((x_1)^2)+(x_1)(x_2)+((x_2)^2)]/((x_1)+(x_2)) where x_1=s+2 and x_2=s^2+t^2+t . The underscore (_) stands for subscript

*February 26, 2010*

**Economics**

A system of equations is given by: F1(x,y,a,b) = x² + bxy + y² - a – 2 = 0 F2(x,y,a,b) = x² + y ² - b² + 2a + 3 = 0 Where x and y are endogenous variables while a and b are exogenous variables. Compute the differentials δx/δb and δy...

*February 26, 2010*

**Calculus**

Represent the function f(x)=10ln(8-x) as a Maclaurin series. sum_{n=0}^infty (c_n) (x^n) The coefficients are C_0= 10ln8 C_1=-10/(8) C_2=-10/128 C_3=-20/3072 C_4=-60/98304 FIND THE RADIUS OF CONVERGENCE: R=?

*February 26, 2010*

**Calculus**

Represent the function f(x)=10ln(8-x) as a Maclaurin series. sum_{n=0}^infty (c_n) (x^n) The coefficients are C_0= 10ln8 C_1=-10/(8) C_2=-10/128 C_3=-20/3072 C_4=-60/98304 FIND THE RADIUS OF CONVERGENCE: R=?

*February 25, 2010*

**Economics**

what does the positive slope of a line with Government expenditure (G) represent when Y=Total expenditure is on the x axis. For simplification, in the equation G=a+tY, where a and t are constants, what does t represent?

*February 23, 2010*

**Maths**

Find the area of the region which is bounded by the polar curves theta =pi and r=2theta 0<theta<1.5pi inclusive

*February 6, 2010*

**Math**

Find the area of the region which is bounded by the polar curves theta =pi and r=2theta 0<theta<1.5pi inclusive

*February 6, 2010*

**Calculus**

Find the area of the region which is bounded by the polar curves theta =pi and r=2theta 0<theta<1.5pi inclusive

*February 6, 2010*

**Maths**

A circle C has center at the origin and radius 9. Another circle K has a diameter with one end at the origin and the other end at the point (0,17). The circles C and K intersect in two points. Let P be the point of intersection of C and K which lies in the first quadrant. Let...

*February 5, 2010*

**Math**

A circle C has center at the origin and radius 9. Another circle K has a diameter with one end at the origin and the other end at the point (0,17). The circles C and K intersect in two points. Let P be the point of intersection of C and K which lies in the first quadrant. Let...

*February 5, 2010*

**Calculus**

A circle C has center at the origin and radius 9. Another circle K has a diameter with one end at the origin and the other end at the point (0,17). The circles C and K intersect in two points. Let P be the point of intersection of C and K which lies in the first quadrant. Let...

*February 5, 2010*

**Calculus**

That answer is not correct

*February 5, 2010*

**Calculus**

Find the area of the region which is bounded by the polar curves theta =pi and r=2theta 0<theta<1.5pi inclusive

*February 5, 2010*

**Calculus**

I got it, u have to integrate (1/2) 4 theta^2 dtheta from theta=0 to theta=pi

*February 5, 2010*

**Calculus**

The answer is not correct, please try again.

*February 5, 2010*

**Calculus**

Find the area of the region which is bounded by the polar curves theta =pi and r=2theta 0<theta<1.5pi inclusive

*February 5, 2010*

**Calculus**

A circle C has center at the origin and radius 9. Another circle K has a diameter with one end at the origin and the other end at the point (0,17). The circles C and K intersect in two points. Let P be the point of intersection of C and K which lies in the first quadrant. Let...

*February 5, 2010*

**Calculus**

Find the area of the region which is bounded by the polar curves theta =pi and r=2theta 0<theta<1.5pi inclusive

*February 4, 2010*

**Calculus**

Match each polar equation below to the best description. Each answer should be C,F,I,L,M,O,or T. DESCRIPTIONS C. Cardioid, F. Rose with four petals, I. Inwardly spiraling spiral, L. Lemacon, M. Lemniscate, O. Outwardly spiraling spiral, T. Rose with three petals 1. r=10-10sin...

*February 1, 2010*

**Calculus**

Find the area of the region bounded by: r=7-1sin(theta)

*January 29, 2010*

**Calculus**

Match each polar equation below to the best description. Each answer should be C,F,I,L,M,O,or T. DESCRIPTIONS C. Cardioid, F. Rose with four petals, I. Inwardly spiraling spiral, L. Lemacon, M. Lemniscate, O. Outwardly spiraling spiral, T. Rose with three petals 1. r=10-10sin...

*January 29, 2010*

**Calculus**

Find the length of the entire perimeter of the region inside r = 16sin(theta) but outside r = 4.

*January 28, 2010*

**Calculus**

Match each polar equation below to the best description. Each answer should be C,F,I,L,M,O,or T. DESCRIPTIONS C. Cardioid, F. Rose with four petals, I. Inwardly spiraling spiral, L. Lemacon, M. Lemniscate, O. Outwardly spiraling spiral, T. Rose with three petals 1. r=10-10sin(...

*January 28, 2010*

**Calculus**

For the following integral find an appropriate TRIGONOMETRIC SUBSTITUTION of the form x=f(t) to simplify the integral. INT (x)/(sqrt(-191-8x^2+80x))dx x=?

*December 14, 2009*

**Calculus**

For the following integral find an appropriate TRIGONOMETRIC SUBSTITUTION of the form x=f(t) to simplify the integral. INT x(sqrt(8x^2-64x+120))dx x=?

*December 14, 2009*

**Calculus**

neither of these videos explain the situation where vaiable x is in the numerator, so i still cant solve it

*December 14, 2009*

**Calculus**

For the following integral find an appropriate TRIGONOMETRIC SUBSTITUTION of the form x=f(t) to simplify the integral. INT (x^2)/(sqrt(7x^2+4))dx dx x=?

*December 14, 2009*

**Maths**

The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.

*December 14, 2009*

**Math**

The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.

*December 14, 2009*

**Calculus**

The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.

*December 14, 2009*

**Calculus**

The following sum [(sqrt(36-((6/n)^2))).(6/n)] + [(sqrt(36-((12/n)^2))).(6/n)]+ ... + [(sqrt(36-((6n/n)^2))).(6/n)] is a right Riemann sum for the definite integral F(x) dx from x=0 to 6 Find F(x) and the limit of these Riemann sums as n tends to infinity.

*December 13, 2009*

**Calculus**

For the following integral find an appropriate TRIGNOMETRIC SUBSTITUTION of the form x=f(t) to simplify the integral. INT((4x^2-3)^1.5) dx x=?

*December 10, 2009*

**Writing**

Please give me ideas for the topics of a 3000 words research/thesis essay

*December 10, 2009*

**Calculus**

For the following integral find an appropriate trigonometric substitution of the form x=f(t) to simplify the integral. INT((4x^2-3)^1.5) dx x=?

*December 10, 2009*

**Calculus**

Find the area enclosed between f(x)=0.4x^2+5 and g(x)=x From x=-5 to x=8

*December 8, 2009*

**Math**

intergrate(e^5x)/((e^10x)+4)dx

*December 8, 2009*

**English**

Thanks Alot

*November 27, 2009*

**English**

I need to give a 5 minute presentation. Please give me some easy, but interesting topics, something which no one else would tend to do.

*November 27, 2009*

**Maths**

f(x)=[sqrt((x-68)^2 + x^3-116x^2-417x+267460)] - 10 To find the minimum value of we need to check the value at the following three points (in increasing order). (You will need to use a numerical method, like Newton-Raphson to find one of these points.) x1=? x2=? x3=?

*November 22, 2009*

**Math**

f(x)=[sqrt((x-68)^2 + x^3-116x^2-417x+267460)] - 10 To find the minimum value of we need to check the value at the following three points (in increasing order). (You will need to use a numerical method, like Newton-Raphson to find one of these points.) x1=? x2=? x3=?

*November 22, 2009*

**Calculus**

I cant find the value of x1. im getting it around -43.2423, but this answer is not correct

*November 22, 2009*

**Calculus**

what is the exact value of the -43 term? i cant find it

*November 22, 2009*

**Calculus**

f(x)=[sqrt((x-68)^2 + x^3-116x^2-417x+267460)] - 10 To find the minimum value of we need to check the value at the following three points (in increasing order). (You will need to use a numerical method, like Newton-Raphson to find one of these points.) x1=? x2=? x3=?

*November 22, 2009*

**Calculus**

There is a point (P) on the graph of [x^2+y^2- 136 x + 12 y + 4560 = 0] and a point(Q) on the graph of [(y + 6)^2 = x^3 - 116 x^2 - 417 x + 267460] such that the distance between them is as small as possible. To solve this problem, we let ((x,y) be the coordinates of the point...

*November 20, 2009*

**Math**

There is a point (P) on the graph of [x^2+y^2- 136 x + 12 y + 4560 = 0] and a point(Q) on the graph of [(y + 6)^2 = x^3 - 116 x^2 - 417 x + 267460] such that the distance between them is as small as possible. To solve this problem, we let ((x,y) be the coordinates of the point...

*November 20, 2009*

**Maths**

There is a point (P) on the graph of [x^2+y^2- 136 x + 12 y + 4560 = 0] and a point(Q) on the graph of [(y + 6)^2 = x^3 - 116 x^2 - 417 x + 267460] such that the distance between them is as small as possible. To solve this problem, we let ((x,y) be the coordinates of the point...

*November 20, 2009*

**Calculus**

There is a point (P) on the graph of [x^2+y^2- 136 x + 12 y + 4560 = 0] and a point(Q) on the graph of [(y + 6)^2 = x^3 - 116 x^2 - 417 x + 267460] such that the distance between them is as small as possible. To solve this problem, we let ((x,y) be the coordinates of the point...

*November 19, 2009*

**Math**

There is a point (P) on the graph of [x^2+y^2- 136 x + 12 y + 4560 = 0] and a point(Q) on the graph of [(y + 6)^2 = x^3 - 116 x^2 - 417 x + 267460] such that the distance between them is as small as possible. To solve this problem, we let ((x,y) be the coordinates of the point...

*November 19, 2009*

**Maths**

There is a point (P) on the graph of [x^2+y^2- 136 x + 12 y + 4560 = 0] and a point(Q) on the graph of [(y + 6)^2 = x^3 - 116 x^2 - 417 x + 267460] such that the distance between them is as small as possible. To solve this problem, we let ((x,y) be the coordinates of the point...

*November 19, 2009*

**Math**

The function((x^2 + 7x + 14)^(1/2)) - x has one horizontal asymptote at y=?

*November 19, 2009*

**Calculus**

Use linear approximation, i.e. the tangent line, to approximate 8.4^(1/3) as follows: Let f(x)= x^(1/3) . The equation of the tangent line to f(x) at x=8 can be written in the form y=mx+c where m=1/12 and c=4/3: Using this, find our approximation for 8.4^(1/3).

*November 15, 2009*