Recent content by XxphysicsxX

Homework Statement Using Hess's Law and any necessary information from your Data Booklet, calculate the molar enthalpy of reaction for the combustion of ethene in kJ/mol. im so lost! i was going to find each sections molar en thalpy and then balance it but what's oxygens and do i multiply...

Homework Statement Calculate the molar heat of reaction for the NaOH(aq) calculate the percent difference for the value u obtained to the value of neautralization of sodium hdroxide, -57 kJ/mol "assume the specific heat capacity of both these substances equal to that of water and that each...

Homework Statement A magnesium ion (Mg 2+) traveling at 60000 m/s enters a mass spectrometer with a magnetic field intensity of 800T. Calculate the radius of deflection forthe magnesium ion. 800T = |B| 24.31g/mol = m 60000 m/s = v 1.66* 10^-27= Atomic mass unit r=? Homework Equations r=...

thankyou!

Problem: An electron enters an external magnetic field in the same direction as the field. Explain what happens to motion of the electron while in the field. I predicted the electron to stay still, since the angle between the direction of speed and external magnetic field is 0. can anyone...

Homework Statement Measurments indicate that there is a weak electric field of 150 N/C surrounding the Earth that points towards the center of the earth. Determine the absolute value of the electric charge of earth. Homework Equations F|e| = ma |E| = |Fe| / |qt| |E| = k|qs| / r^2...

thankyou so muchhh!

:cry:Homework Statement A 2000 kg car strikes a staitionary 1200 kg car and rebounds at 65.0 km/h@ 20 (deg) Sof E. After collision, the 1200 kg car moves at 40.00 km/h @ 35(deg) N of E. Determine the velocity of the 2000 kg car before the collision. m1= 2000 kg V1(before) = ? V1(after)...

i get: Fd (Vw- Vs) = VwFs Fd( Vw-Vs) - Vw= Fs and i don't go ant further since the first Vw is a possitive and the second is a negative... meaning they'll cancel each other out.. dont know what I am doing wrong!

i get: Fd (Vw- Vs) = VwFs Fd( Vw-Vs) - Vw= Fs but the two Vw just cancel each other out again.. I don't know what I am doing wrong...

how do i rearrange for Vw?? I just end up canceling the Vw's when I solve it... Thanks in advance the formula is: (Fd)= [(Vw) / (Vw-Vs)] (fs)

The problem: I have to answer a question about the Doppler effect using the formula attached. I know i have to solve for Vw, but I get Vw/Vw=(Fd/Fs)(-Fs) and I am possitive that's not right, can someone please help me out?? Thankyou

Thank you very much for looking over it!

Problem: A 78.5kg man is about tocompletea bungee jump. If the bungee cord has a spring constant of 150 N/m, determine the period of oscillation that we will experience. m= 78.5 Kg k= 150 N/m T=? Relevant equations: T= 2(pi)√(m/k) The attempt at a solution T= 2(pi)√(78.5kg/150...

Oops yes, I meant 25m. Thank you! :)