Recent content by netrunnr

if I that I get the law of sins for 20N/ø =r/150º I still have two unknowns here :(

Homework Statement There are two forces on the 3.2 kg box in the overhead view of the figure below but only one is shown. The figure also shows the acceleration of the box. F1 is in Q I and F2 is in Q III a = 12m/s2 there is a picture here that I do not know how to upload -- it shows F1 in...

first thanks for pointing out the math error 9 - 6.37 is 2.63! my bad. yes, this is my problem. it was taken from the x-axis in QII and I was taking it from the norther direction in Q II so I did 51º + 90º and it should have been 180º - 51º giving me an angle of 129º from the positive x...

Homework Statement Only two horizontal forces act on a 3.0 kg body that can move over a frictionless floor. One force is 9.0 N, acting due east, and the other is 8.2 N, acting 51° north of west. What is the magnitude of the body's acceleration? Homework Equations F=ma The Attempt at...

just learned something very important today regarding this - and it was the source of my confusion here: Speed is the rate of change of distance with time. Velocity is the rate of change of displacement with time. I thought speed was acceleration... so on that note: my problem...

omg a *duh* moment indeed. lesson here : do not overthink a solution :biggrin:

So what exactly is the rate that distance divided by time gives? Is it not acceleration?

Hmmm I seem to have my vocabulary messed up... Would it be correct to say a = distance/time?

Homework Statement a vehicle starts from rest and accelerates at a reate of 2.0m/s2 in a straight line til it reaches a speed of 20m/s. then it slows to constant 1.0m/s2 til it stops. how much time elapses from start to stop? how far does the vehicle go? Homework Equations I have...

A shell is shot with initial velocity \vec{}v_{0} is 20ms^{-1} at an angle \vartheta = 60 degrees. At the top of the trajectory, the shell explodes into two fragments of equal mass. Fragment1 has a speed of 0 immediately after the explosion and falls vertically. How far from the gun does...

A father racing his son has half the kinetic energy of the son who has half the mass of the father. The father speeds up by 1.0m/s and then has the same kinetic energy as the son. what are the original speeds of the father and the son? using k=1/2mv^2 and solving for v I did this: M = mass K =...

I SEEE okay so the kinetic energy decreases going up and increases going down. at the point of origin it recaptures all the kinetic energy it lost on the way up... so then after encountering air resistance its kinetic energy is less than what it was when it started? right? so <100J ? yah...

nope :( doesn't say anything about air resistance.

A ball is thrown into the air with 100J of kinetic energy. When it returns to its original level after encountering air resistances what is it kinetic energy? I have KE = 0.5m * v^2 I am not sure how to approach this problem as I don't have the mass or the velocity or the height of the...