Recent content by Ereny

Kk thanks I figured it out!

Homework Statement A marble with a mass of 2.0 grams moves to the left with a velocity of 2.0m/s when is collides with a 3.0 gram marble moving in the opposite direction with a velocity of 2.0 m/s. if the first marble has a velocity of 1.5m/s to the right after the collision determine the...

Homework Statement a spring stretches 8.0 cm when a 500. grams mass is hung from it. a. determine the spring constant.the mass is originally pulled 10.0 cm from equilibrium position. calculate the total energy in the system, and the EPE and KE if the distance is 4.0 cm from the equilibrium ...

would the initial velocity be 3 then.. ahh i am soo confused and oohh my teacher said to ignore the part where the trampoline goes downward and that way it will be easier to figure out i guess.

i think i see where i messed up i forgot to square the 28.2 .. but when i did i got X= .29 m does that look okay? or is it too small...

okay so here's my work correct me if i am wrong please change KE + change PE + change GPE = 0 F(1/2mv^2)-I(1.2mv^2) + F(1/2kx^2)- I(1/2kx^2) + F(mgh)-I(mgh) =0 (1/2*16kg * 28.2 - 0) + (0-1/2 * 2000N/m * X^2 ) + (0- 16kg * 9.81* 40m) = 0 i solved for X and i got a neg # idk why but the...

kk thanks and one more thing can you help me out too with this question https://www.physicsforums.com/showthread.php?t=595625

ohh kk .. why did they give me the velocity then.. doesn't that mean i have to use it?

and i think i typed the velocity wrong in the question is should be .50 m/s

okay so here's what i did 200N x 10m + 50 N x .5om/s = 2025

yeah well 200 n includes the 9.81 so i don't need to include it again right?

i did that but i got a really big number for the distance i got the same distance as its given.. i did : 1/2(2000)x^2 - 1/2(2000)(40)^2=0 ? i don't think this is right

ben carries a 200N suitcase up three flights of stairs total vertical distance of 10.0m and then pushes the suitcase with a horizontal force of 50.0 N at a constant speed of 50 m s for a horizontal of 35.0 m across the 3rd floor how much work does Ben do on the suitcase during this entire motion...

and the equation for PE is 1/2kx^2 right?

a partially filled bag of cement is tossed off of bridge with an initial upward velocity of 3.0 m/s. the bag has a mass of 16 kg and falls 40.0 m to the river below. determine the velocity of the bag just before striking the water. i found that and it comes out to be 28.2 m/s ( correct me if...