Recent content by controlfreaks

perfick, thanks guys!

i know how to calculate the torques but the force applied by f is not given, that's why I'm wondering if the answer should be givin in terms of f?

the long side is along the x-axis and the sheet is in the xy plane.

yes the point that f acts on is the opposite point to the origin. and it's pushing in at the rectangle in the minus x direction. the question definatly asks to find the total torque at point O and hence THEN find the balancing f required. do i take it that the answer to the first part...

Homework Statement A thin sheet of metal is pivoted at one corner (the origin) and it's free to rotate about the origin in the xy plane. It has sides of 1.6m and 1.2m. two forces f and -Mgj are acting on the sheet of metal. f acts parallel to the x-direction (in the minus direction) and -Mg is...

so would it be that the angular velocity is equal to 2pi divided by time taken?

how do i use the period of the Earth to find out the angular velocity?

sorry, here's what i did m=2x10^3 r=0.2 Icm = (2mr^2)/5 Icm = [2(2x10^3)(0.2)(0.2)]/5 = 32

Homework Statement A satellite is orbiting at 3000Km above the equator so that's it's angular velocity is the same as Earths. Assuming the Earth to be a sphere of radius 6400Km, estimate the linear velocity of the satellite relative to the centre of the Earth given that the Earth rotates...

ok here's what i got i've used the old formula (2mr^2)/5 to work out Icm of one of the spheres and got an answer of 32 but when i plug that into the formula with I = Icm + md^2 I'm not getting the right answer. the answers for the two problems on this are a) 4.171 b) 8.671 I...

bump! can anyone help on this? much appreciated!

thank you so much, that's perfect. just didn't know if we we're dealing with angular velocity or something more complicated here. cheers!

hey thanks for the reply so will there be 2 axes? both in the Z direction through the spheres on the dumbell? is that why the Parallel Axis Theorem is used. I've looked up about it but what i need to do here is still unclear to me.

Homework Statement A parachutist jumps from a plane which is at position S = [0, 5000, 0] at time t = 0. The starting velocity of parachutist is v = [300, 0, 100] and we're assuming the parachutists falls like a particle with constant acceleration a = [2, -9.81, 0]. I need to find the...

ok i get what you mean there! total mass is 20.2Kg so why do we need the impulse? and as far as the thrust goes how do we now find what this would be. I don't need you to solve for me, just let me kno what's happening with it. cheers!