Recent content by jigoku_snow

hey there, I'm a little confuse on how to draw a s-t graph from a v-t graph :( based on the graph attached, the displacement of C is lesser than D, but why the s-t graph is not like in a 'bell' shape ( curve down from D to C) ? instead it went up? if the question were to ask for a...

Homework Statement 1) how to prove that sin square x cos square x is identical to 1/8 (1- cos 4x)? 2) f(x) = x square +7x -6 ----------------, show that when x is sufficiently small for (x-1)(x-2)(x+1) x^4 and higher powers to be neglected. Homework Equations 1) cos (s +...

Homework Statement a block of mass 100 kg is being moved steadily by pulling on a rope attached to the block making an angle of 30 degree with the horizontal. if the tension of the rope is 120 N, what is the coefficient of friction? Homework Equations T- Ff = ma F= μRThe Attempt at a Solution...

arent the pressure is equal on all sides? the area in the bottom = 5 x 4 = 20 m^2 sides= 3 x 4 = 12 m^2 front= 3 x 5 = 15 m^2

"a water tank has a rectangle base of area 5m x 4 m and is 3 m deep" let the length = 5m width = 4 m height = 3 m F acting on (x) = F that acting on the sides (left / right) F acting on Z= F acting on the wall behind/ front

P=F/A P acting on the base (y) = h rho g = 3 x 1000 x 9.81 = 29500 Pa F= 29500 x 20 = 5.9 x 10 ^5 N F acting on the sides (x) = 5 x 1000 x 9.81 x 12 = 5.9 x 10 ^5N F on (z) = 4 x 1000 x 9.81 x 15 = 5.9 x 10 ^5 N * why is my upthrust force is different from the answer given? *...

Homework Statement 1)a water tank has a rectangle base of area 5m x 4 m and is 3 m deep. if it is full of water, calculate the thrust on the base and on each side. 2)a model helicopter of mass 5 kg rises with constant acceleration from rest to a height of 60 m in 10 s. find the thrust exerted...

all right . i got it ;) thanks .

v = s/t gives the average velocity, not the final velocity. How are they related? okay. now i know that the final velocity is twice the average velocity. i thought the average v will be the final v (OMG) You are subtracting vectors, not finding displacement. You are finding the change in...

i don't get what 'the velocity is not constant but the acceleration is' means. isn't to find a variable (a or v) from the formula a=(v-u)/t ,we will get the same answer ? i'm stuck here : a=(v-u)/t, v=s/t=6. a=1 m/s^2. u=0 (at rest) , 1=v/6, final v= 6 m/s is it a need to find the...

net force =0

component of the rope tension= mg sin theta = 500N . given the tension of the rope is 120 N. is that means the total pulling force = 120 + 500= 620 ? 'moved steadily' which means a=0 ? then pulling force = sliding? if yes then mg sin theta + friction force = 620. friction force = 120 N...

[FONT="Arial Black"]Homework Statement 1) a girl applies a steady force to a stationary trolley which has a mass of 18 kg for 6 s. she moves it 36 m in this time. determine the impulse which she produced. 2) a satellite of mass 240kg moving in a free space at velocity of 600 m /s is...