Recent content by Iceclover

Problem: a rock is thrown vertically with a velocity of 20m/s from the edge of a bridge 42m above the river. how long does the rock stay in the air. Equation: d=vt+1/2at^2 Atempt at solution: I've actually had a couple of attempts and i came up with a bunch of crazy things. I just...

oooh ok i think i get it...i think. The answer i came up with was 1.2x10^3

so would i use Eki+Epi=Ekf+Epf?

Homework Statement Magen's mass is 28kg. she climbs the 4.8m ladder of a slide and reaches a v3elocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Magen Homework Equations Ep=mgh Ek=1/2mv^2 W=Fd The Attempt at a Solution I really just have no...

would it gain 400J? i really just don't get this

and if an object was falling and was losing 400J of potential energy how much kinetic energy would it gain?

the work-energy therom?

Homework Statement A 98N sack of grain is hoisted to a storage room 50m above the ground floor of a grain elevator. a) how much work was required b) what is the potential energy of the sack of grain at this height c) the rope being used to lift the sack of grain breaks just as the sack...

ok sounds good, i think I am going to make a new topic though

do you have time for another question?

ok good, thank you very much

the answer i got was 26m

what do i do once I've found velocity

Work done on object is equal to the change in its kinetic energy

ok so that's right then?