Recent content by honlin

So the scale is the one who exerted a force on the chain?

Is it the tension of the chain that stop it from falling down?

Supporting the weight of the chain that is still falling? Since the chain that is still falling is in contact with the scale, there must be a normal contact force right?

Yeah, there shouldn't be any tension left when it is released, the string stays on top due to inertia. Therefore I should be calculating the downward resultant force, which is the chain that is still falling and the weight of the fallen chain. Is that right?

Homework Statement A chain of mass M and length L is suspended vertically with its lowest end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length of chain, x , has fallen? (Neglect the size of individual links.) Homework Equations...

I think it would. For the ball to float on the water, the ball has 2 forces acting on it, an upward buoyant force, and a downward weight. Buoyant force must be bigger than the weight for the ball to float. Since the water exerts an upward buoyant force, by Newton Third Law, the ball exerts a...

You make a careless mistake with the weight of the crate. It is not 500, check again and you will get the correct answer =)

Homework Statement A beaker is filled with water and its weight is measured by a balance scale. The reading is recorded as R1. 1. A ping pong ball is now submerged in the water without touching the wall and the bottom of the beaker. What is the reading, R2 of the balance scale? 2. A steel...

Yea, you can work out from there. Try to find the total energy from the Q,C,V.

For the first part, i agree with you that the potential difference between two plates should be the same because it is still attached to a battery. For the second question, think it this way: which quantity is the same for all the capacitors when you connect them in parallel, while which...

Why don't you try to draw a vector diagram and make a closed triangle from the three forces?

For the second part, since they will stop at the same distance, how can we relate distance, force, mass and velocity together? Think along this line and u will get the answer surely. The answer in part b will not be the same as in part a:wink:

after calculating the momentum for each vehicles,by relating it to force and time, you will have 2 equations. Since they will stop at the same time, which one is easier to stop? The vehicle with larger momentum or the lower one? You can link those equations together since both equations have the...

For the first question, why don't u calculate the momentum for each vehicles? What is the relationship between momentum, force and time?

Btw, the momentum approach is for part 1, it will be easier to solve the 2nd question with another way