Homework Statement
I need to find out which freezes faster--hot or cold water--without doing a lab. Just by thinking and considering laws and theories and properties we have learned about.
Homework Equations
N/A
The Attempt at a Solution
It seems like it would be cold water since...
So this isn't homework, but it is for a class and I don't know how to go about this... I have to figure out if hot or cold water freezes faster. Any ideas?
Homework Statement
Find the number of kilograms needed to pull apart evacuated Magdeburg Hemispheres whose radii are 25.0 cm when the barometer reads 760mm of Hg.
I really don't know where to start. Could someone walk me through it?
Homework Equations
Unknown.
The Attempt at a...
Homework Statement
A spring is stretched by a force of 0.80n a distance of 0.012m. Find how far it will stretch when the force is 0.54n.
One problem is that I don't know how to find k.
Homework Equations
F=kΔd
The Attempt at a Solution
F=kΔd
F=k(0.012m)
What is k?