Recent content by davidatwayne

ok, i think i got it... i was looking for how v for the x direction and v for the y direction were related... thanks for your help guys : )

I am still not getting it... I tried using the quadratic formula to solve for the time, using 64 (y) = [19.8 (initial velocity) x t] - (1/2)(9.8)t^2 I came up with an answer of 2.02 seconds. then I used: x = [v (initial velocity) x time] + (1/2) x (-9.8) x (time squared) came...

kicking rock of a building... Homework Statement A boy kicks a rock at a velocity of 19.8 m/s horizontally off the top of a 64 meter high building. How far from the top does the rock hit the flat ground? (neglecting air resistance) Homework Equations sorry, i don't know how to type...

Homework Statement Air is trapped above liquid ethyl alcohol in a rigid container. If the air pressure above the liquid is 1.1 atm, determine the pressure inside a bubble 4.0 m below the surface of the liquid. Homework Equations P= P(nought) + (density)(gravity)(height) density of...

ok... i think i got it... after getting the correct force (and units) times the displacement of x, (1800 * 75)/10... gives the correct answer. thanks.

force = mass times acceleration 1000 x 15= 15000

Homework Statement A 1000 kg car, starting from rest, accelerates uniformly to 15 m/s in ten seconds. Assume air resistance is constant at 300N. What is the average power delivered by the engine? Answers a. 13500 W b.18000 W c. 23000 W d. 27000 W Homework Equations Average power =...

Thanks a lot guys, it makes a lot more sense now.

Homework Statement A sample of an unkown material weighs 200 N in air and 150 N when immersed in water. What is the specific gravity of this material? Homework Equations specific gravity = (density/density of water) density of water is 1000 kg/m^3 The Attempt at a Solution I...