Recent content by Ripe

The question states that the bird feeder is supported by the three cables. This implies that the net force is zero. Hence find expressions for each component force and continue from there.

That's centriputal force, isn't it? Also, I was under the impression that centripetal force is more of a description of a force than an actual force. On that basis, isn't the only force the horizontal tension force which ACTS like a centriputal force?

Ah! I didn't pay any attention at all to the fact that it says horizontal table. I'm aware of the fact weight has no horizontal direction. But since its on the horizontal table, we can assume that the net force on the vertical direction is 0, correct? Also, what would the centrifugal force be?

Ah. You mean that when it is at the highest point, the centriputal acceleration will have the same magnitude and direction as gravity and thus, we can deduce that the centriputal acceleration is 9.8ms^-2?

Circular momentum - Tension of a string. Homework Statement A body of mass 1kg is tied to a string and rotates on a horizontal frictionless table. If the length of the string is 40.0 cm and the speed of revolution is 2m/s, find the tension in the string. 2. The attempt at a solution...

Homework Statement A loop-the-loop machine has radius 18m. What is the minimum speed at which a cart must travel so that it will safely loop the loop? Homework Equations centripetal acceleration: v^2/r velocity=(2r*pi)/t Perhaps more? The Attempt at a Solution To be honest...

It doesn't travel up the plane, it travels down the plane. I.e. it has an initial speed of 6m/s when it is at the top (the beginning) and a speed of 12m/s at the bottom (the end). Hence, initial KE=0? EDIT: Oh! Now I see what you mean. It didn't go from rest to 12m/s meaning it had some kinetic...

Not sure If I follow what you're saying. Could you elaborate?

I'd very much like help on this one!

Please elaborate. I assumed it was 0.

Homework Statement An 8kg ball moves down a 12m high inclined plane with a speed of 6m/s. By the time it reaches the bottom, the speed is measured to be 12m/s. What is the frictional force opposing the motion? The inclined plane has an angle of 30 degrees with respect to the ground. Homework...

I'm a bit sleepy at the moment and might have overlooked something, but it doesn't make sense that the acceleration is positive when the ball slows down by 9,5m/s..

The formula for average velocity is Δs/Δt, i.e. change in displacement over the change in time (or time taken), as I hope you're aware of. Now, what you have to do is find an expression for time, using s for displacement and the known speeds. Try it yourself from there and reply if you're...

Again, thank you very much for your help. You really clarified some things for me!

I double-checked my calculations and got 25585N again.