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1. ### r & s are two vectors and |r| = 5. What is the value of |r+s| when s is perpendicular to (r+s) and |s| = 3?

|r+s|^2 = (r+s) dot (r+s) = |r|^2 + 2 (r dot s) + |s|^2 Given |r| = 5, and |s| = 3 we have: = 5^2 + 2 (r dot s) + 3^2 = 34 + 2 (r dot s) since s is perpendicular to (r+s), s...

2 Answers · Science & Mathematics · 18/02/2015

2. ### Solve for r?

95.5 = (1/(1+r)) * (29.4/r) = (29.4)/{(1+r)(r)}; (95.5) {(1+r)(r)} = 29.4; {(1+r)(r)} = 29.4/95.5 = 0.30785 r^2 +r = 0.30785 r^2 +r - 0.30785 = note that (r +1/2...

1 Answers · Education & Reference · 13/11/2007

3. ### how to calculate curl((r_)/r^3)?

r = <x, y, z>, ||r|| = (x^2 + y^2 + z^2)^(-1/2) So, we need to compute curl <...

4 Answers · Science & Mathematics · 02/03/2011

4. ### integral from 1 to infinity r^-3 ln(r) dr calculus 2 help?

r^-3 ln(r)dr u = lnr ; dv = r^-3dr du = (1/r)dr ; v = (-1/2)r^-2 = (-1/2)r^-2 ln(r) + ∫(1/2...1/2)r^-2 ln(r) + [(-1/4)r^(-2)] integrate from 1 to infinity = (-1/2)r^-2 ln(r) + lim(a->infinity) [(-1/4)r^(-2)] integrate from 1 to a...

2 Answers · Science & Mathematics · 23/10/2011

5. ### What the difference between playo dvd +r and -r??

Hi, The DVD+R and DVD-R are competing ...the formats. However, because the DVD-R format has been in use since 1997, it has...

4 Answers · Consumer Electronics · 22/02/2007

6. ### Prove r divides b . . .?

r solves x^2 + ax + b = 0 => r*r + a*r = -b => (r+a)*r = -b Since r,a are integers, -b is an integer multiple of r, and so is b, hence r divides b.

3 Answers · Science & Mathematics · 03/02/2013

7. ### dvd = r and dvd-r?

Hello, The DVD+R and DVD-R are competing ...the formats. However, because the DVD-R format has been in use since 1997, it has...

2 Answers · Consumer Electronics · 12/02/2008

8. ### Solve for R?(Math)???????

Multiply by r: 1 - 1/2 r^2 = 3/5 r 1/2 r^2 + 3/5 r - 1 = 0 5 r^2 + 6r - 10 = 0 And solve using the quadratic equation.

3 Answers · Science & Mathematics · 05/08/2009

9. ### (r-2)/(r+2)-2r/(r+9)=6?

[(r-2)(r+9) -2r(r+2)] / [(r+2)(r+9)] = 6 (r^2 + 7r -18 -2r^2 - 4r) / [(r+2)(r+9)] = 6 (-r^2 + 3r - 18) / (r^2 + 11r + 18) = 6 -r^2 + 3r - 18 = 6(r^2 + 11r + 18) = 6r^2 + 66r + 108 7r...

1 Answers · Science & Mathematics · 06/05/2010

10. ### True or false: if f'(r) exists, then lim x ->r f(x) = f(r)?

assume r is any number. {r} as x becomes sufficiently close to that number, f(x) becomes arbitrarily close to f(r). for example: say r = 7 which means: f(r) = f(7) as x approaches...

1 Answers · Science & Mathematics · 14/10/2013