Recent content by Jennifer001

[b]1. Homework Statement [/b the ends of a 20cm long,2cm diameter rod are maintained at 0degrees and 100degrees by immersion in an ice-water bath and boiling water. heat is conducted through the rod at 4.5x10^4J/h. of what material is the rod made? Homework Equations Q/dt=k(A/L)dT The...

oo i added it wrong for dT its suppose to be -114-20 instead of 114-20 ok thank you

oooh sorry that 114 is suppose to be -114

Homework Statement a beaker contains 200mL of ethyl alcohol at 20degrees. what is the minumum amount of energy that must be removed to produce solid ethyl alcohol.. the melting/freezing pt is 114degrees Lf=1.09x10^5 density is 790kg/m^3 specific heat cap = 2400J/kgK Homework Equations...

so is the equation: MscwdT+MwcwdT=MicidT+MwcwdT Ms= mass of steam Mw= mass of water Mi= mass of ice.. sorry I'm really lost in thermodynamics

Homework Statement steam at 100C is added to ice at 0C find the amount of ice melted and the final temperature when the mass of steam is 10g and the mass of ice is 50g Homework Equations Q=mcdT Q=ML The Attempt at a Solution Qmelt=MiciT+MiLf =0.05(2090)(100C)+(0.05)(3.33x10^5)...

nvm forget this question i just figured out how to do it... i forgot to put the negative sign for the iron since it loses heat.

Homework Statement a 4kg iron hammer is initally 700 degree celcius is droppped into a bucket containing 20kg of water at 25degree celcius. what is the final temperture Homework Equations q=mc(delta)T The Attempt at a Solution m1=4kg m2=20kg T1=700=973K T2=25=298 i know...

Homework Statement A 60-cm-long, 500 g bar rotates in a horizontal plane on an axle that passes through the center of the bar. Compressed air is fed in through the axle, passes through a small hole down the length of the bar, and escapes as air jets from holes at the ends of the bar. The...

simple way to solve this is by using galilean transformation equations and turn one of the balls into a stationary one and just use the 1D formulas

oo thank you i was confused

that g is suppose to be acceleration i used the wrong symbol, it's on the x-axis not the y axis sorry i confused you

Homework Statement a sled slides along a horizontal surface on which the coeffient of kinetic friction 0.25. its veocity at pt A is 8m/s at pt B its 5m/s. use impulse-momentum theorem to find how long the sled takes to travel from A to B Homework Equations P=J The Attempt at a...

Homework Statement a toy train rolls around a horizontal 1.0m diameter track. the coeffifient of rolling friction is 0.10 a. what is the magnitude of the train's angular acceleration after it is released b. how long does it take the train to stop if it's released with an angular speed of...

Homework Statement a sailboat is traveling east at 5m/s. a sudden gust of wind gives the boat an acceleration of .80m/s^2, 40 degree north of east. what are the boat's speed and direction 6 s later when the gust susides? I am completely lost on this question.. i don't know how to approach...