# Yahoo Web Search

1. ### how much energy transfered as heat:100kg tank of water is warmed from 10* C to 25* c = 4180 J/kg . K ?

...note that degree kelvin in specific heat does not call for converting deg C to deg K because difference of temp (dt) is used. deg K = 273 + deg C ...

1 Answers · Science & Mathematics · 20/06/2007

2. ### Carbon-14 has a half-life of 5730 years . In a plant fossil, you find that the 14 C has decayed to.. How long ago was this plant allive?

... radioactive decay, you have : -------------------------------------------- dC/dt = ( - k ) ( C ) dC/ C = ( - k ) dt ln ( C / C0 ) = ( - k ) t C ...

1 Answers · Science & Mathematics · 20/03/2015

3. ### Find a.b and a x b if a=i+2j+ k and |b|=3 acting along c =i+j+ k .?

...vector c has a direction of (i+j+ k )/√3 and since vector b is along c vector b = 3(i+j+ k )/√3 = √3(i+j+ k ) a.b = [i + 2j + k ] . [ √3(i+j+ k ) ] applying the above...

1 Answers · Science & Mathematics · 18/06/2013

4. ### A temperature of 88 F is equivalent to what temp in Kelvin ( K ) scale?

Celsius [° C ] = [ K ] − 273.15 [ K ] = [° C ] + 273.15 Fahrenheit [°F...33 + 273.15 Réaumur [°Ré] = ([ K ] − 273.15) × 4⁄5 [ K ] = [°Ré] × 5⁄4 + 273.15 Rømer [°Rø] = ([ K ...

1 Answers · Science & Mathematics · 10/02/2014

5. ### If vector A = 7 i - 5.8 j, vector B = -8.0 i + 8.1 j + 4.2 k , and vector C = 6.8 i - 7.2 j.?

Summing B & C we get (-8.0 + 6.8) i + ( 8.1 - 7.2)j + 4.2k = -1.2i + 0.90j + 4.2k Now... so for a ) dor product = 7*(-1.2) + -5.8*0.90 = -13.6 b) A + C = (7 + 6.8) i + (-5.8 - 7.2)j = 13.8i - 13j So dot product = 13.8*(-8...

1 Answers · Science & Mathematics · 17/02/2010

6. ### An electromagnetic wave with components Ey = Eo sin(kx - ωt) and Bz = Bo sin(kx - ωt) is a wave with a?

...offset, we have: (2) y (x, t) = A * sin(kx - ωt ), where: (3) k = the wavenumber = 2π / λ also called the angular spatial frequency...the closest of the choices given is: C )3w/(2pi). .

2 Answers · Science & Mathematics · 12/07/2012

7. ### Why can changes in temperature, delta theta, be given either in kelvin or celsius? and other thermal questions?

1 K = 1 C , by definition, only the Celsius scale starts at 273.15 K ...

2 Answers · Science & Mathematics · 24/01/2009

8. ### How have temperature scales been formed?

... as the freezing point of water and 100 ° C was defined as the boiling point of... point of water is 32°F at sea level. ° K The Kelvin scale is named...

1 Answers · Science & Mathematics · 01/11/2010

9. ### A styrofoam cooler ( k = 0.030 W/(m•° C ) has outside dimensions of 0.150 m × 0.310 m × 0.360 m, ?

Thermal resistance= t/ k = 0.022/ 0.03 = 0.733 m^2 degC/W Heat transfer coeff U= 1/0.733= 1.3636 W/m^2 deg C Q= UA delta T Area = 2 (0.15*.31) + 2(0.15* 0.36...

2 Answers · Science & Mathematics · 10/05/2011

10. ### A power supply, resistor, and capacitor are all connected in series with V = 24 V, R = 22 k Ω, and C = 150 pF r?

time constant = RC C in FARADS = (2.2 X10^4)( 150 x10^-12) = 3.3 X10^-6sec V = Vs( 1- e^(-t/rc)) V = 24(1-e^( 25 x10^-9/ 3.3 X10^-6sec))

1 Answers · Science & Mathematics · 20/03/2013