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1. ### Given 3 vectors: A = 4k B = 8i + k C = 3i - 4j then C(A • B) =_______?

A = 4k = 0i + 0j + 4k B = 8i + k = 8i + 0j + k C = 3i - 4j = 3i - 4j + 0k Now, (A • B) = (0*8 + 0*0 + 4*1) = 4...

2 Answers · Science & Mathematics · 24/09/2012

2. ### Show that the vectors, A = i – 2j +k, B = 3i + - j + k, C = i + 4j +7k are mutually orthogonal to A.?

If B and C are mutually orthogonal to A, then A • B = 0 and A • C = 0 A • B = 3 + 2 + 1 = 6 A • C = 1 - 8 + 1 = 0 A is orthogonal to C but not to B If B = 3i + j - k...

2 Answers · Science & Mathematics · 18/05/2009

3. ### What is a)wavelength,λ b)wave vector, k c)frequency, f d)frequency of this signal, ω?

Wavelength is the distance between two peak points on a sinusoidal oscialltaing wave: http://en.wikipedia.org/wiki/Wavelength Wave Vector is the magnitude and direction of the wave: http://en.wikipedia.org/wiki/Wave_vector Frequency is...

2 Answers · Science & Mathematics · 17/12/2013

4. ### Group velocity calculation for w=k*c/n(k)?

Because n(k) is an explicit function of k and thus it must be considered; reason is that the partial derivative in this case considers variations along the k axis and, most certainly, n will have a contribution to it.

1 Answers · Science & Mathematics · 21/02/2013

5. ### Is the book Sympathetic Vibrations by K.C Cole  outdated?

2 Answers · Science & Mathematics · 21/02/2013

6. ### does k.c.l & k.v.l depend on the relationship between current and voltage in a resistor,explain?

CURRENT is the number of electrons that flow per second (specifically, one amp of current is a Couloub of electrons per second). If you drill a large hole and a small hole in a barrel of water, the CURRENT of water would be...

3 Answers · Science & Mathematics · 01/01/2009

7. ### Given 3 vectors: A = 4k B = 8i + k C = 3i - 4j then C + (A X B) =?

Then, we have... (3i - 4j) + (4k x (8i + k)) = (3i - 4j) + (32j - 32k) = 3i + 32j - 36k Good luck!

1 Answers · Science & Mathematics · 30/09/2012

8. ### the air temp in Athens dropped from 64.6 deg-F to 34.3 deg-F. Express the temp drop in K, C, F?

To get the diff in F, just subtract. To get C or K, multiply that by 5/9

1 Answers · Science & Mathematics · 19/02/2009

9. ### What is the minimum amount of heat needed to completely melt 200 g of silver(melting point=1235 K; c=236J/kg K; Lf=105kJ/kg)at 250 degree C?

250°C = (250 + 273 K) = 523 K 200g = 0.2kg First find the heat needed (Q1) to raise the silver from 523K to its melting point (1235K): Q1 = m.c.ΔT = 0.2 x 236 x (1235 - 523) Note Lf = 105kJ/kg...

1 Answers · Science & Mathematics · 17/03/2015

10. ### Helium has the lowest boiling point of all elements. it boils at -269 degrees C. expressed in kelvin degrees?

K = C + 273 = -268 + 273 = 4 K So, B is the correct answer.

4 Answers · Science & Mathematics · 29/10/2009