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so i did this: 706^4 - 353^4 =2.329*10^11 um now how do i find the ratio of the change from this?

Homework Statement if the temperature of an object changes from 80 to 433 degrees Celsius, but the area and emissivity remains constant, by how much does radiated power increase? Homework Equations P=phi*A*e*T^4 The Attempt at a Solution i tried to do this: 80^4-433^4. and get the...

Homework Statement ice has formed on a pond and steady state has been reached. the air temperature above the ice is -10 degrees celcius, while at the bottom of the pond the temperature is 4 degrees celcius. the total depth of the ice and water is 0.50m. if the thermal conductivites of ice and...

Homework Statement how much energy is required to change a 40g ice cube from ice at -10degrees C to steam at 110degrees C. Homework Equations Q=mL Q=mcT The Attempt at a Solution My failed attempt was this, 0.04*120*333000(333000 is the latent fusion heat for water) i don't know...

Collisions..PLEASE HELP! Homework Statement (a) A nuclear reactor (see below) contains nuclei that fission when bombarded by slow neutrons. The fission reaction produces fast neutrons which need to be moderated (i.e. slowed down) in collisions before they can cause further fissions. In this...

um i converted 135 feet in metres which gave me 41...nd oh don't worry i know why we use sin now, i drew the diagram wrong before, i made 135 feet the x-axis instead of the hypotenuse but yea the only thing that is worrying me know is why did we just do 41sin40 and left the 1000 out?

umm the main problem in this question i am getting is that how can i calculate work without force or force without work? i don't know how to find both of them out, like if 1 more unit number was given either work or force then i would have been able to solve it..

hey umm i got the answer by doing this.. 41.148*sin40=259(which is the correct answer).. but i do not understand that why do we not multiply it by 1000 aswel? and when i drew the tri diagram..it came out that i should be using 41.148cos40 instead of sin..but i had to use sin to get the right...

umm W=F*d and W=Ki-Kf..dat relates force and energy?

umm sory i could not figure out wht yu said..could you please give some some steps of equation to work with? thx

Homework Statement a 1000kg roller coaster car is initially at to of a rise, a point A. it then moves 135ft, at an angle of 40degrees below the horizontal, to a lower point B. choose the car at point B to be zero configuration for gravitational potential energy of the roller coaster-Earth...

Homework Statement A 2100kg pile driver is used to drive a steel I-beam into the ground. the pile driver falls 5.00m before coming into contact with the top of the beam. then it drives the beam 12cm farther into the ground as it comes to rest. using energy considerations calculate the average...

Calculating the max distance of compression of the spring please HELP! Homework Statement A 2.0 kg block is dropped from a height of 40 cm onto a spring of force constant k = 1960 N/m. The maximum distance the spring is compressed is? Homework Equations I Used the equation W=mgh and...

thx a lot for ur help! really appreciate it=]

First, determine the volume at B and then the pressure at C. (Hint: use ideal gas law. Be careful about temp. scale). With that, you can determine the temperature at C, which is the same as the temperature at A. AM hi um i tried to do it as u advised, but i was not able to get the right...