Recent content by scotthands

anyone?

ok: A body is fired vertically upwards with an initial velocity of 100m/s. (a) how far will it rise (b) how long will it take to reach maximum height? (c) what is the time taken before it strikes the ground again. (d) what is the velocity at impact ---------------------------------------------...

Wait i think this is it: u=100m/s a=9.81 v=0 I'm not sure about the acceleration.

right, so i use: v^2=u^2+2as u=100m/s a=? v? I don't no what to use for a or v :confused:

Homework Statement A body is fired vertically upwards with an initial velocity of 100m/s. (a) how far will it rise (b) how long will it take to reach maximum height? (c) what is the time taken before it strikes the ground again. (d) what is the velocity at impact Homework Equations...

damn, i still can't figure it out, it may be the notation that's confusing me but i don't know. I have the info from the question: The initial velocity is 0, displacement is 409.5m(ithink) and the acceleration is 9.8. I just can't seem to use these values to come up with the time.

i think I've just to use the equations above and mybe this one too: v^2=u^2+2as

Homework Statement A body falls from a height of 409.5m under gravity. Determine: (a) The time taken to reach the ground, if the initial velocity is zero (b) The velocity at impact with ground.Homework Equations s= ut v= u+at s=ut + 0.5*at^2The Attempt at a Solution i tried using the formulas...

how do i convert km/hr to m/s?

Homework Statement A train accelirates uniformly from rest to reach a speed of 54km/hr in 200 seconds after which the speed remains constant for 300 seconds, At the end of this time the train decelerates to rest in 150 seconds. Calculate the acceleration and retardation.Homework Equations s=...

thank you

yeah i accidentally entered the post before i finished it, it's finished now.

Homework Statement A deisel train accelerates uniformly from rest to reach 60km/hr in 6 minutes, after which the speed remains constant. Calculate the total time taken to travel 6km and the acceleration. Homework Equations s= ut v= u+at s=ut + 0.5*at^2 The Attempt at a Solution I'm not sure...

so have i just to work out P? as in: P=T(tau) * Area ? if so then I'm not really sure about the area, do i take the 10mm diameter and work out the area that the rivets go through?(or is it the perimeter of the 10mm diameter the hole that the rivets go through?) thanks for the help.

shear stress, what is a flat tie bar...? Homework Statement two lengths of flat tie bar are connected together by a lap riveted joint with three rivets each 10mm in diameter. Calculate the maximum pull that can be applied to the tie-bars if the shear stress in the rivets is not to exceed...