Recent content by octu

Ok ,that makes sense. I think I am missing something here. I'm using Fi to represent the total horizontal impulse force (is it right to call it that?), which I then break into two components, one parallel to the surface, and one perpendicular. So is the perpendicular force here the impulse...

Ok. So we have a value for the velocity of the ball immediately before it hits the cart.##{ v }_{ b }=\frac { { F }_{ s } }{ m } \frac { T }{ 2\pi }##Part b can be answered in two different ways based on the two possible assumptions regarding the impact: either the ball is assumed to stick, or...

Let’s proceed in the 2ndway you mentioned. I’m not sure how I would go about proceeding in the 1st way without knowing more about the ball. I think my issue was that I was considering the impulsive force of the ball hitting the cart to be normal to the cart surface. Now I see that the impulse...

There is a certain elastic energy stored in the cord that gives the ball its velocity. We assume that when the ball hits the cart, all of the elastic energy has been converted into kinetic energy. X naught is the fully stretched length of the cord. Assume also that the cord’s unstretched length...

what do you guys think of my solution? Is it valid to use the Dirac delta function to find the speed of the ball?

Ok, so looking at the slinky I can assume that when the ball is released, the tension in the cord will not be relieved near the cart. And if the barrier is rigid, then the normal force will do no work. So, another attempted solution: a) The cart will not move when the ball is released...

When I Read the question I took "right after" to mean "immediately after". This is my attempt at a solution. What do you think? I used the Dirac delta function to find the impulses. Thanks for the help, I appreciate it. a) The cart will move to the right after the ball is released. When the...

There is a normal force acting on the cart from the wall, equal to the pulling force from the cord. Just after the ball is released, perhaps the pulling force decreases, and the normal force pushes the cart to the right. Is that reasoning valid?

Homework Statement [/B] A 1kg cart, a 0.1kg ball, and an elastic cord connecting the ball and the cart, are placed in a weightless environment; see Figure. The cart has the shape of a symmetric trapezoid with its left and right edges at a 60-deg angle from the vertical. It is also attached with...

In the cable-pulley system shown here, block A is moving upwards at a speed of 5m/s and block C is moving downwards at a speed of 2.5m/s. What is the speed of block B? (See attached picture) This seems easy, I just want to make sure I'm not crazy. If mass B moves downward some distance d...