how about this one?
latent heat of fusion(L) = 80 cal g
Mc = mass of ice
heat gained = (Mc *4180 * 15) + (Mc * L) + (Mc * 4180 * t)
heat gained = (30 * 4180 *15) + (30 * 80) + (30 * 4180 * t)
t = -15c
final temp is -15c
30g of ice at -15 degree celcius is added to 100g of water at 25 degree celcius. What is the final temperature?
T1=ice
T2=H2O
at equilibrium must have
m1c1(Te-T1)+m1k=m2c2(T2-Te) [k=3.3x10^5 J/K fusion heat coeff.]
then
Te=(m1c1T1+m2c2T2-m1k)/(m1c1+m2c2)
T1=268 k
T2=298 K...
1. What force is needed to pull a 10kg box across a floor that has a coefficient of friction of .34?
my answer
F = W * f * x
F = .34(10)(9.8) = 33N
2. The carts of a roller coaster are traveling 5 m/s over the top of the first hill. If there is no energy loss due to friction and the...
is it the other way around? I don't have strobescope and wheel in front of me so I can't guess. :(
as for #7, do i have to use 4.17 one instead of 5.83 as alpha?
can I get equation for #7 then?
10, I think it would appear to move slower in same direction and 11, it would appear to move faster in opposite direction. I am not really sure. :(
Thank you. Here are rest of questions. I think I got 6, 7 right but I don't understand from 8 to 11 at all. How do I do these? :(
question 6)Find I, the moment of inertia for the color wheel in kg m^2.
I = 1/2 mr^2
I = (1/2)(133.4)(12.7^2)
I = 10758/1000 = 10.758 kg m^2
question 7)...