Recent content by John78

can anyone help?

Homework Statement Calculate the power that can be safely transferred by a 100 mm shaft rotating at 150 revolutions per minute. Homework Equations Radius = diameter/2=100/2=50 mm Shaft from mild structural steel K=6 T= 320 N/mm2 The Attempt at a Solution J=(3.14/2)*r4...

Homework Statement A mild steel column has a cross section of 100m by 50mm. Assuming a safety factor of 6 calculate the load that it can safely support Homework Equations W=A*δ The Attempt at a Solution δ=470 N/mm2*0,1667= 78,34 mm2 A=100mm*50mm=5000mm2 W =5000*...

Homework Statement A beam has a solid square cross section of 100mm and is simply supported by two supports 3m apart. Calculate the dead load that can be safely supported when applied to the middle of the beam. Homework Equations Dead Load= volume * weight of material The...

Homework Statement Calculate the distance of the centre of gravity from the support A Homework Equations one crate = 3000N The Attempt at a Solution Anyone know how to start?

My calculation looks like that Angular velocity: 360/57.3=6.28 rad/s 6.28 rad/s / 6= 1.04 rad/sec but what about angular acceleration? Am I right i thinking?

My calculation looks like that crate = 300 kg 1 kg=10N 300Kg*10=3000N Ra*42 m = 3000N *6m Ra = 428,57 N Rb*42 m = 3000N *36m Rb=2571,42 N MA=3000N*6m-2571,42 MA=-89999,64 Ra+Rb=428,57+2571,42=2999,99=3000N! So the answer is Ra = 428,57 N Am I right i thinking?

I know only that crate = 300 kg

not for every one :C

Homework Statement Calculate the moment of the force exerted by the crate around support A. Homework Equations crate = 300 kg 1 kg=10N 300Kg*10=3000N The Attempt at a Solution Ra*42 m = 3000N *6m Ra = 428,57 N Rb*42 m = 3000N *36m Rb=2571,42 N I just want to check...

Homework Statement Calculate the angular acceleration and angular velocity of a 4 kg object rotating in a circle of 3 m radius in a time of 6 s. Homework Equations Angular acceleration = ω2*r Angular velocity= angular displacement/time ? The Attempt at a Solution Really...

angular acceleration = 0 what about angular velocity?

Homework Statement Calculate the angular acceleration and angular velocity of a 4 kg object rotating in a circle of 3 m radius in a time of 6 s. Homework Equations The Attempt at a Solution Angular acceleration = ω2*r C=2∏r= 2*3.14*3=18.84 360°/57.3°=6.28 rad/s 6.28/6=...

now i am confused :C

so CF = m r ω2 CF = 6*6*(37.68)2=51112?