hmm h = 6.51 is incorrect according to the website (also tried -6.51).
i've been reading up on this physics site just trying to understand these problems. I've kind of given up on finishing my hmwk by midnight, but i do have a midterm tomorrow and I want to understand how this works so i still...
if i set the answer given from problems a and b equal to potential energy (mgh) i get some ridiculously small number. 10.994 / 700 / 9.8 = h = .00159 which seems impractical and is incorrect
if i have Kei + Ui + W = kf + Uf where Kei, Ui, and kf all = 0 I'm left with W = Uf which gives me the...
i see, i guess i had my equation wrong. Well that gets me A and B but I'm having trouble figuring out how to get the second part. if H is 0 where you drop the block, would that make me use -mgh and set that equal to final potential energy (which i don't think i know)?
Homework Statement
A 700 g block is released from rest at height h0 above a vertical spring with spring constant k = 380 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 24.0 cm.
(a) How much work is done by the block on the...
ok i figured it out on my own and for anyone else wondering out there about this problem let me explain.
using what i said in the before post
ke=1/2mv^2
initial Ke + W = Ke final (which i'll call Kei and Kef now)
at x=3 the work area added up under the line is 2 (at 0) 0 (at 1) -2 (at 2) and -4...
ok I'm just stabbing in the dark here but this is what i was thinking
Ke=1/2mv^2
initial Ke + W = Ke final
so if for part a x=3 and the force is -4 at that point work should be -12.
the velocity at 0 is 4 m/s so initial kinetic energy is 19.2
19.2-12=7.2 kinetic energy at x=3
Homework Statement
The only force acting on a 2.4 kg body as it moves along the x-axis varies as shown below. The velocity of the body at x = 0 is 4.0 m/s.
(a) What is the kinetic energy of the body at x = 3.0 m?
(b) At what value of x will the body have a kinetic energy of 8.0 J?
(c) What...
A 3.5 kg block (m1) and a 1 kg block (m2) are connected by a string and are pushed across a horizontal surface by a force applied to the 1 kg block as shown below. The coefficient of kinetic friction between the blocks and the horizontal surface is 0.3. If the magnitude of vector F is 27 N...
The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.30 with the floor. If the train is initially moving at a speed of 43 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide over...