Recent content by dennislam

Homework Statement Homework Equations KVL The Attempt at a Solution Using KVL around BE loop 0-0.6-i_e*(30*10^3)-15=0 i_e=-0.52mA However, I stuck when I tried to find i_c and use KVL around CE loop/ CB loop For CE loop: 10-i_c*(15*10^3)-Vce-i_e*(30*10^3)-15=0 For CB loop...

Homework Statement Two masses have same mass m, both of them are tied by a string and put in a hollow cylinder. When the cylinder start to rotate until the angular speed is ω. The tension in the string is T and the string breaks, both masses move away from the axis in the hollow cylinder...

Homework Statement Homework Equations v=rω conservation of energy The Attempt at a Solution I don't know whether it is correct or not, and I am quite confused in part b it asks the angular speed of the pulley can I say that v=rω since the pulley and box A,B have a common velocity? so is ω...

Thank you for all of you help! It seems like I can get the correct solution now:kiss: mg-T=ma a=rα 1.25T=Iα just solve the above equations and I can get α=2.65 rad s^-2:biggrin:

Homework Statement https://holland.pk/uptow/i4/ae8d3da6c3ce3cad10eb98dd3208a955.png Homework Equations τ=I⋅α The Attempt at a Solution I want to discuss in part (a) of the question Tension in 5 kg block string=mg=5*9.8=49N Taking moment at the pivot, a net torque acting on 15 kg post is...