Recent content by ducdat231

I'm sorry, my bad, the particle was traveling in the helical path r=cos(t)i+sin(t)+tk but at t=pi it changed and took the tangential path to the initial path. So I figured out it would travel on the direction of the velocity vector which I was given as the direction vector.

Can someone please help me with this? Homework Statement A particle begin to travel (in 3-d dimension) at time t=pi with the direction vector d=-sin(t)i+cos(t)j+k 2. The attempt at a solution Find the position vector r of that particle and the location of that particle at time t=2pi...

initially the ball was as translating but after traveled distance (d) it change to spinning due to the friction with the lane

Homework Statement A bowling ball with radius (R) and mass (m)hit the ground and traveled a distance (d) before it started to roll due to the force of friction cause by the coefficient of friction (mu) between the ball and the lane. Homework Equations I=2/5mR^2 F=ma torque=I*alpha...