Recent content by sallychan

Okay Thank you very much!

So the steam will always condense when in contact with water in lower temperature?

Oh right. I understand. But can you explain a bit more on the heat exchange of condensation? I really want to fully understand it. Thanks a lot!

Oh so you are saying that the steam will condensate? If that is the case, the total amount of water will become 500g + 100g = 600 g. But how does that happen? Isn't it water does not remove enough latent heat from the steam?

I think the bubbles will float on the surface of the water... just guessing

Theoretically, when water reaches 100C, they become steam?

But how am I going to find the final temperature if all water is boiled?

Homework Statement 100 g of steam at 100 °C is mixed with 500 g of water at 25 °C. What is the final temperature of the mixture? Homework Equations Q= mL Q= mcΔT The Attempt at a Solution Heat given by to water = heat loss at condensation = mLv...

Homework Statement Homework Equations I don't know how is it related to center of mass. The Attempt at a Solution I don't know how to begin. Thanks a lot for your help !

Homework Statement A meter stick is 200 g. A mass of 1 kg is placed in 20 cm, and another mass of 5 kg is placed in 100 cm. So the diagram will be like: Homework Equations Why do we have to include M2? And why is the mass of M2 is 200g? Isn't the whole meter stick weight...

Does it mean that impulse always exist during the collision?

Hi guys. I just got a general question. Homework Statement I learned about impulse today in class, and I just wonder why it exists? Impulse is defined as "the change in momentum", but momentum is always conserved in elastic collision. Homework Equations So if momentum is conserved, why...

Got it. Thank you so much for clearing up my confusions :)

Yea I guess the data I got is probably not accurate. By the way,I am just asking, when I calculate the KE of the cart, should I use the mass of the cart only or the total mass of the system? And should I consider PE of the hanging mass?

The work done by tension is supposed to equal to the change in kinetic energy of the cart, but I don't know why I can't get that result. There is a huge difference between the work and change in kinetic energy.