Recent content by mistymoon_38

thanks! i think i got it.

Homework Statement Do not attempt to do this experiment! You are sitting on railroad tracks, and extremely fast trains are approaching from both the left and the right. These trains have equal speeds, and both send out a warning signal with their horns. You hear this signal at a frequency...

i figured it out on my own. thanks anyways

Homework Statement and why is it FLcos(30)? Homework Equations The Attempt at a Solution So by looking at the soln, D(distance)=Lcos(30), which should be the hieght of the traingle. But the distances between a the forces at any point don't always add up to the hieght.. I am confused

thanks i figured it out

Homework Statement Q(t) is the amount of carbon 14 at time t. Given half life of 5730 years, and assuming that Q satisfies dQ/dt=-rQ; determine decay constant r Homework Equations The Attempt at a Solution I solved the differential equation and got Q=ce^-rt. Now what? And hints/help?

thanks i think i got it now.

Homework Statement A car starts from rest and moves around a circular, horizontal, level track of radius 30 m. Its speed increases at the constant rate of 0.5 m/s^2. (a) What is the magnitude of the net acceleration 15 s later? (b) What angle does the net acceleration make with the car's...

Object rolling off a sphere... Homework Statement A small object begins at the top of a frictionless solid sphere. Its initial speed is negligibly small. The sphere is stationary at all times. The small object then slides down the surface of the sphere. At one point the small object loses...

Homework Statement Three rectangular blocks of equal mass m slide to the right along a frictionless horizontal surface accelerated by a force F applied to the left side of the left-most block. (a) Draw a free-body diagram for each block. (b) Determine the magnitudes and directions of all of...

null space=[x ] [-x]?? So then its not orthogonal??

[SOLVED] Quick Question: Is this matrix an orthogonal projection? Homework Statement P=[0 0 ] [11] Homework Equations The Attempt at a Solution Its orthogonal if the null space and range are perpendicular. Range=[0 ] [x+y] null space=[x

OK I finally got it... 333.4 and 63.4 are the angles, just flip the diagram and put it on the positive side...I was just having trouble visualizing what you were saying and what I myself was trying to think...Thanks!

So I flipped the triangl of diagram one and got angles of 206.5 and 63.4. Their y components sums to zero which is good but the only problem is their x components add to a negative number. And since vector 3 is negative, can they ever sum 0?

What if I moved the vector L=2 to the fourth quadrant and vector L=1 to the first quadrant?