Accelerating Definition and 654 Threads

I have been stuck on this problem for so long... It's seriously driving me insane. The problem: An incline plane that makes an angle of 28 degrees to the horizontal is mounted on wheels. A small block of mass m=0.9kg rests on the plane, held there by a coefficient of static friction...

Here is the problem from one of my online homework site. :-( An object starts at time t = 0 with a velocity of v0 = +4 m/s and undergoes a constant acceleration of a = -17 m/s2. There's five small parts to this problem but I got 4/5 done. I'll post them anyway to give you guys a clearer...

Someone is shooting faster than light particles at you and you accelerate toward the shooter. Do the tachyons speed up, slow down or remain the same speed?

As far as I am aware scientists agree that the universe is flat, open or closed. However, if galaxies get further away from each other the gravitational attraction between them would decrease as the universe expands. Why is the universe speeding up not a real possibility?