Homework Statement
Find the amount of thermal energy that flows per day through a solid oak wall 10.0 cm thick, 3.00 m long, and 2.44 m high, if the temp of the inside wall is 21.1 C while the temp of the outside wall is -6.67 C.
Homework Equations
Q= k(A)(T2-T1)t/d
coefficient of...
Homework Statement
There is an aluminum ring, .07 m in diameter at 5 deg. C. There is also an aluminum shaft whose diameter is .07003 m in diameter at 5 deg. C. What temp. should the shaft be cooled such that the ring will fit over the shaft.
Homework Equations
/\L = Coefficient...
i know the specific heat of water is 4,186..so its 4,186 J/kg C to raise x grams of water by one degree
and the energy required to melt ice is the latent heat of fusion..which is Q = MLf
i just don't know how to appy this and use it.
ok, well i know ice at 0 degrees C ---->water at 0 deg. C , so you use the vaporization law Q = mLv so 'm' is the variable in this case, since I am trying to find how much of the ice was needed, so the formula is :
Q = 'm'(2.26 x 10^6)
and then water at 0 deg. C ----> water at 75 deg...
How much ice at 0 degrees Celsius must be mixed with 50.0 g of water at 75.0 degrees Celsius to give a final water water temp. of 20 degrees Celsius?
ive been trying to work this out for the past hour, but having trouble...any help would be appreciated.
stuck on Change of Phase problem
How much ice at 0 degrees Celsius must be mixed with 50.0 g of water at 75.0 degrees Celsius to give a final water water temp. of 20 degrees Celsius?
ive been trying to work this out for the past hour, but having trouble...any help would be appreciated.
A block is propelled up a 48 degree frictionless inclined plane with an initial velocity of 1.20 m/s...A) how far up the plane does the block go before coming to a rest. B) How long does it take to move to that position?
for part A) , i have initial velocity and I am looking for x...
ahh silly me...i was fooled by the word 'accelerating' and thought the acceleration was 3.00 m/s...i should have noticed it wasn't even in the right units to be acceleration...ok, i have the initial velocity and final...thanks for the jump start i needed
Problem : A car is to tow a 2,270kg truck with a rope. How strong should the rope be so that it will not break when accelerating the truck from rest to 3.00 m/s in 12.0 seconds?
So I assume it wants me to find the tension?...but the 12 seconds is throwing me off...I'm not sure what that...
thank you astronuc, you cleared up the distance portion for me, i can visualize in my head now...but for the A=9.8, when is it negative and when is it positive...i'm still unsure about that
my teacher said that if i make Acceleration a negative (-9.8), then i have to make the distance X negative also, which would be (-30) ... or you can make both positive,...as long as they are set up with the same sign, it will work out...
is this true?
Hi, having trouble with the following problem:
A stone is thrown vertically upward from a bridge 30.0m high at an initial velocity of 15.0 m/s . How long will it take for the stone to hit water?
I set it up first by writing my givens down:
initial velocity = 15.0 m/s.
distance (x)...
damn...i used Oksanav's advice and here's where I am stuck
x= 1/2 (25,000m/3,600s + 65,000m/3,600s)(8.5s)
x= 1/2 (90,000m/7,200s) (8.5s)
now here's where I am gettin stuck...im multiplying (90,000m/7,200s) by (8.5s) and getting 106.25 and then taking half of that because of the '1/2'...
x= initial velocity(time) + 1/2at squared
x = 25(8.5) + 1/2(1.31)(8.5 squared)
x= 212.5 + .655(8.5squared)
x= 212.5 + 72.91
x= 285.41
yet, x is supposed to be 106 in the book