Recent content by Nubcake

I was more concerned about the direction and the force ; doesn't the weight of the barrel act in the opposite direction of movement?

I have always managed to solve problem asking how much work is being done but then once I start to think about the work being done I get confused. E.g A barrel of weight 200N is raised by a vertical distance of 1.8m by being moved along a ramp. The work done here would be 200 x 1.8 =360J . I do...

Calculate 5 \Sigma r=0 r(r+1) (Sorry I don't know how to do the proper notation online) How do you calculate the sum for this since the common difference is changing? I tried to write them out separately so the sum of r x sum of r+1 but I don't know how you put that in the sum formula. Sn =...

If two people of different masses say 50kg and 100kg were to suddenly jump off a building , why would the person with more mass attain a higher terminal velocity? I thought mass was irrelevant. I missed 1 lesson on this in class but this part I don't understand properly. If they were the same...

Find the sum of \Sigma 200 r=5 5r-2 Sn = n/2 [2a + (n-1)d ]I used S 200 and I got about 101400 but then when I verified on my calculator it was 100058, my calculator has the sigma notation for working out the sum of , how do you get 100058?

Rubber has roughly a stress of 1.0 MPa per unit strain . how much stress has been applied to the rubber band? Stress = f/a though it was straight forward and used the formula for stress but when I looked at the answer it was 2.0 x 10^6 Pa But why?

I guess I must have made a mistake with F = ma now that I think about it , I didn't rearrange the formula for mass .

Well I used it and got a different answer to the right answer , instead of F = ma , W = mg is used.

Why doesn't F = ma work in this situation ?

1.Atmospheric pressure is 101kPa a) Calculate the total force exerted by the atmosphere on the surface of the Earth. Radius of Earth is 6.4 Mm b)Calculate the mass of the Earth's atmosphere , State any assumptions made. P = F/A ρ = m/v [\b] [b]a) Surface area of a sphere is...

Force applied per unit area perpendicular to a surface , ... so it's N m^-2?

Are the SI units for pressure N m^2 or is it N m^-2?

I think he got a little higher than that about 800+ but he slowed down afterwards.

Just saw it now , he didn't manage to break the world record i think because he deployed his parachute at 4 min 19 seconds.

This is not really a h/w question but one thing I so not understand with this precedence table in critical path analysis , why would it needs two dummies?Activity. | Depends On A | - B | - C | A D | B E | B,C...